88521399 has 24 divisors (see below), whose sum is σ = 138944000. Its totient is φ = 54101520.

The previous prime is 88521379. The next prime is 88521401. The reversal of 88521399 is 99312588.

It is a happy number.

It is not a de Polignac number, because 88521399 - 2¹¹ = 88519351 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 (88521379) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3049 + ... + 13650.

Almost surely, 2^88521399 is an apocalyptic number.

88521399 is a deficient number, since it is larger than the sum of its proper divisors (50422601).

88521399 is a wasteful number, since it uses less digits than its factorization.

88521399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16755 (or 16752 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 88521399 is about 9408.5811363882. The cubic root of 88521399 is about 445.6727592775.

The spelling of 88521399 in words is "eighty-eight million, five hundred twenty-one thousand, three hundred ninety-nine".