87474815 has 4 divisors (see below), whose sum is σ = 104969784. Its totient is φ = 69979848.

The previous prime is 87474811. The next prime is 87474823. The reversal of 87474815 is 51847478.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51847478 = 2 ⋅25923739.

It is a cyclic number.

It is not a de Polignac number, because 87474815 - 2² = 87474811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87474811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8747477 + ... + 8747486.

It is an arithmetic number, because the mean of its divisors is an integer number (26242446).

Almost surely, 2^87474815 is an apocalyptic number.

87474815 is a deficient number, since it is larger than the sum of its proper divisors (17494969).

87474815 is a wasteful number, since it uses less digits than its factorization.

87474815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17494968.

The product of its digits is 250880, while the sum is 44.

The square root of 87474815 is about 9352.7971751771. The cubic root of 87474815 is about 443.9094027607.

The spelling of 87474815 in words is "eighty-seven million, four hundred seventy-four thousand, eight hundred fifteen".