87415978 has 32 divisors (see below), whose sum is σ = 146800080. Its totient is φ = 38776320.

The previous prime is 87415969. The next prime is 87415987. The reversal of 87415978 is 87951478.

It is an interprime number because it is at equal distance from previous prime (87415969) and next prime (87415987).

It can be written as a sum of positive squares in 8 ways, for example, as 35676729 + 51739249 = 5973^2 + 7193^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85108 + ... + 86128.

Almost surely, 2^87415978 is an apocalyptic number.

87415978 is a deficient number, since it is larger than the sum of its proper divisors (59384102).

87415978 is a wasteful number, since it uses less digits than its factorization.

87415978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162.

The product of its digits is 564480, while the sum is 49.

The square root of 87415978 is about 9349.6512234414. The cubic root of 87415978 is about 443.8098535148.

The spelling of 87415978 in words is "eighty-seven million, four hundred fifteen thousand, nine hundred seventy-eight".