30977028 has 36 divisors (see below), whose sum is σ = 80128048. Its totient is φ = 10085040.

The previous prime is 30977027. The next prime is 30977041. The reversal of 30977028 is 82077903.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 30976983 and 30977001.

It is not an unprimeable number, because it can be changed into a prime (30977027) 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, 8458 + ... + 11553.

Almost surely, 2^30977028 is an apocalyptic number.

It is an amenable number.

30977028 is an abundant number, since it is smaller than the sum of its proper divisors (49151020).

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

30977028 is a wasteful number, since it uses less digits than its factorization.

30977028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20064 (or 20059 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 30977028 is about 5565.7010340118. The cubic root of 30977028 is about 314.0604505844.

The spelling of 30977028 in words is "thirty million, nine hundred seventy-seven thousand, twenty-eight".