30670728 has 32 divisors (see below), whose sum is σ = 83648160. Its totient is φ = 9294080.

The previous prime is 30670727. The next prime is 30670763. The reversal of 30670728 is 82707603.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (30670727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57825 + ... + 58352.

It is an arithmetic number, because the mean of its divisors is an integer number (2614005).

Almost surely, 2^30670728 is an apocalyptic number.

It is an amenable number.

30670728 is an abundant number, since it is smaller than the sum of its proper divisors (52977432).

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

30670728 is a wasteful number, since it uses less digits than its factorization.

30670728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116197 (or 116193 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 30670728 is about 5538.1159251139. The cubic root of 30670728 is about 313.0218795417.

The spelling of 30670728 in words is "thirty million, six hundred seventy thousand, seven hundred twenty-eight".