30724440 has 64 divisors (see below), whose sum is σ = 97601760. Its totient is φ = 7710720.

The previous prime is 30724433. The next prime is 30724483. The reversal of 30724440 is 4442703.

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 30724440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5491 + ... + 9570.

Almost surely, 2^30724440 is an apocalyptic number.

30724440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30724440 is an abundant number, since it is smaller than the sum of its proper divisors (66877320).

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

30724440 is a wasteful number, since it uses less digits than its factorization.

30724440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15092 (or 15088 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 24.

The square root of 30724440 is about 5542.9631064982. The cubic root of 30724440 is about 313.2044991190.

The spelling of 30724440 in words is "thirty million, seven hundred twenty-four thousand, four hundred forty".