87571978 has 16 divisors (see below), whose sum is σ = 141621480. Its totient is φ = 40372416.

The previous prime is 87571973. The next prime is 87571987. The reversal of 87571978 is 87917578.

It can be written as a sum of positive squares in 4 ways, for example, as 23843689 + 63728289 = 4883^2 + 7983^2 .

It is not an unprimeable number, because it can be changed into a prime (87571973) 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, 35976 + ... + 38332.

Almost surely, 2^87571978 is an apocalyptic number.

87571978 is a deficient number, since it is larger than the sum of its proper divisors (54049502).

87571978 is a wasteful number, since it uses less digits than its factorization.

87571978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3801.

The product of its digits is 987840, while the sum is 52.

The square root of 87571978 is about 9357.9900619738. The cubic root of 87571978 is about 444.0736999915.

The spelling of 87571978 in words is "eighty-seven million, five hundred seventy-one thousand, nine hundred seventy-eight".