87438565 has 32 divisors (see below), whose sum is σ = 116328960. Its totient is φ = 62813184.

The previous prime is 87438563. The next prime is 87438577. The reversal of 87438565 is 56583478.

It is a cyclic number.

It is not a de Polignac number, because 87438565 - 2¹ = 87438563 is a prime.

It is a super-5 number, since 5×87438565⁵ (a number of 41 digits) contains 55555 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87438563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 171531 + ... + 172039.

It is an arithmetic number, because the mean of its divisors is an integer number (3635280).

Almost surely, 2^87438565 is an apocalyptic number.

87438565 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

87438565 is a deficient number, since it is larger than the sum of its proper divisors (28890395).

87438565 is a wasteful number, since it uses less digits than its factorization.

87438565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621.

The product of its digits is 806400, while the sum is 46.

The square root of 87438565 is about 9350.8590514455. The cubic root of 87438565 is about 443.8480748642.

The spelling of 87438565 in words is "eighty-seven million, four hundred thirty-eight thousand, five hundred sixty-five".