30899520 has 84 divisors (see below), whose sum is σ = 106291380. Its totient is φ = 8239104.

The previous prime is 30899501. The next prime is 30899521. The reversal of 30899520 is 2599803.

It can be written as a sum of positive squares in 2 ways, for example, as 17239104 + 13660416 = 4152^2 + 3696^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30899521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2485 + ... + 8244.

Almost surely, 2^30899520 is an apocalyptic number.

30899520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30899520 is an abundant number, since it is smaller than the sum of its proper divisors (75391860).

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

30899520 is a wasteful number, since it uses less digits than its factorization.

30899520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10752 (or 10739 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 30899520 is about 5558.7336687415. The cubic root of 30899520 is about 313.7982936512.

The spelling of 30899520 in words is "thirty million, eight hundred ninety-nine thousand, five hundred twenty".