87978042 has 32 divisors (see below), whose sum is σ = 197313600. Its totient is φ = 29055024.

The previous prime is 87978041. The next prime is 87978047. The reversal of 87978042 is 24087978.

It is not an unprimeable number, because it can be changed into a prime (87978041) 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, 1588 + ... + 13359.

It is an arithmetic number, because the mean of its divisors is an integer number (6166050).

Almost surely, 2^87978042 is an apocalyptic number.

87978042 is an abundant number, since it is smaller than the sum of its proper divisors (109335558).

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

87978042 is a wasteful number, since it uses less digits than its factorization.

87978042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15067 (or 15061 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 87978042 is about 9379.6610812971. The cubic root of 87978042 is about 444.7590194645.

The spelling of 87978042 in words is "eighty-seven million, nine hundred seventy-eight thousand, forty-two".