87125618 has 4 divisors (see below), whose sum is σ = 130688430. Its totient is φ = 43562808.

The previous prime is 87125609. The next prime is 87125627. The reversal of 87125618 is 81652178.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81652178 = 2 ⋅40826089.

It is an interprime number because it is at equal distance from previous prime (87125609) and next prime (87125627).

It can be written as a sum of positive squares in only one way, i.e., 44262409 + 42863209 = 6653^2 + 6547^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21781403 + ... + 21781406.

Almost surely, 2^87125618 is an apocalyptic number.

87125618 is a deficient number, since it is larger than the sum of its proper divisors (43562812).

87125618 is a wasteful number, since it uses less digits than its factorization.

87125618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43562811.

The product of its digits is 26880, while the sum is 38.

The square root of 87125618 is about 9334.1104557424. The cubic root of 87125618 is about 443.3179237237.

It can be divided in two parts, 8712 and 5618, that multiplied together give a square (48944016 = 6996²).

The spelling of 87125618 in words is "eighty-seven million, one hundred twenty-five thousand, six hundred eighteen".