87977978 has 8 divisors (see below), whose sum is σ = 143964000. Its totient is φ = 39989980.

The previous prime is 87977951. The next prime is 87977983.

87977978 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×87977978² = 15480249225936968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87977978.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1999478 + ... + 1999521.

It is an arithmetic number, because the mean of its divisors is an integer number (17995500).

Almost surely, 2^87977978 is an apocalyptic number.

87977978 is a deficient number, since it is larger than the sum of its proper divisors (55986022).

87977978 is a wasteful number, since it uses less digits than its factorization.

87977978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3999012.

The product of its digits is 12446784, while the sum is 62.

The square root of 87977978 is about 9379.6576696594. The cubic root of 87977978 is about 444.7589116172.

The spelling of 87977978 in words is "eighty-seven million, nine hundred seventy-seven thousand, nine hundred seventy-eight".