30745656 has 80 divisors (see below), whose sum is σ = 91214640. Its totient is φ = 9642240.

The previous prime is 30745651. The next prime is 30745657. The reversal of 30745656 is 65654703.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 30745656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30745651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9621 + ... + 12411.

It is an arithmetic number, because the mean of its divisors is an integer number (1140183).

Almost surely, 2^30745656 is an apocalyptic number.

30745656 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30745656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45607320).

30745656 is an abundant number, since it is smaller than the sum of its proper divisors (60468984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30745656 is a wasteful number, since it uses less digits than its factorization.

30745656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2826 (or 2813 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 36.

The square root of 30745656 is about 5544.8765540813. The cubic root of 30745656 is about 313.2765743978.

The spelling of 30745656 in words is "thirty million, seven hundred forty-five thousand, six hundred fifty-six".