87866405 has 16 divisors (see below), whose sum is σ = 116650368. Its totient is φ = 63000000.

The previous prime is 87866351. The next prime is 87866411. The reversal of 87866405 is 50466878.

It is not a de Polignac number, because 87866405 - 2⁶ = 87866341 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 7346 + ... + 15155.

It is an arithmetic number, because the mean of its divisors is an integer number (7290648).

Almost surely, 2^87866405 is an apocalyptic number.

It is an amenable number.

87866405 is a deficient number, since it is larger than the sum of its proper divisors (28783963).

87866405 is a wasteful number, since it uses less digits than its factorization.

87866405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22588.

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 87866405 is about 9373.7081776637. The cubic root of 87866405 is about 444.5708187968.

The spelling of 87866405 in words is "eighty-seven million, eight hundred sixty-six thousand, four hundred five".