30879987 has 16 divisors (see below), whose sum is σ = 42232320. Its totient is φ = 20061152.

The previous prime is 30879971. The next prime is 30879991. The reversal of 30879987 is 78997803.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 30879987 - 2⁴ = 30879971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30879907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54568 + ... + 55130.

It is an arithmetic number, because the mean of its divisors is an integer number (2639520).

Almost surely, 2^30879987 is an apocalyptic number.

30879987 is a deficient number, since it is larger than the sum of its proper divisors (11352333).

30879987 is a wasteful number, since it uses less digits than its factorization.

30879987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 30879987 is about 5556.9764260792. The cubic root of 30879987 is about 313.7321576283.

The spelling of 30879987 in words is "thirty million, eight hundred seventy-nine thousand, nine hundred eighty-seven".