30513840 has 160 divisors (see below), whose sum is σ = 110992896. Its totient is φ = 6789120.

The previous prime is 30513839. The next prime is 30513851. The reversal of 30513840 is 4831503.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 30513840.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68659 + ... + 69101.

Almost surely, 2^30513840 is an apocalyptic number.

30513840 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 30513840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55496448).

30513840 is an abundant number, since it is smaller than the sum of its proper divisors (80479056).

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

30513840 is a wasteful number, since it uses less digits than its factorization.

30513840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507 (or 501 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 30513840 is about 5523.9333812058. The cubic root of 30513840 is about 312.4872400123.

The spelling of 30513840 in words is "thirty million, five hundred thirteen thousand, eight hundred forty".