30661740 has 96 divisors (see below), whose sum is σ = 96707520. Its totient is φ = 8164800.

The previous prime is 30661739. The next prime is 30661747. The reversal of 30661740 is 4716603.

30661740 is a `hidden beast` number, since 3 + 0 + 6 + 617 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (30661747) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43390 + ... + 44090.

It is an arithmetic number, because the mean of its divisors is an integer number (1007370).

Almost surely, 2^30661740 is an apocalyptic number.

30661740 is a gapful number since it is divisible by the number (30) 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 30661740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48353760).

30661740 is an abundant number, since it is smaller than the sum of its proper divisors (66045780).

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

30661740 is an equidigital number, since it uses as much as digits as its factorization.

30661740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731 (or 711 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 30661740 is about 5537.3043983512. The cubic root of 30661740 is about 312.9912997272.

The spelling of 30661740 in words is "thirty million, six hundred sixty-one thousand, seven hundred forty".