30861616 has 40 divisors (see below), whose sum is σ = 63202304. Its totient is φ = 14575680.

The previous prime is 30861583. The next prime is 30861619. The reversal of 30861616 is 61616803.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30861619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20605 + ... + 22051.

Almost surely, 2^30861616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30861616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31601152).

30861616 is an abundant number, since it is smaller than the sum of its proper divisors (32340688).

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

30861616 is a wasteful number, since it uses less digits than its factorization.

30861616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529 (or 1523 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 30861616 is about 5555.3232129193. The cubic root of 30861616 is about 313.6699305210.

The spelling of 30861616 in words is "thirty million, eight hundred sixty-one thousand, six hundred sixteen".