87791438 has 24 divisors (see below), whose sum is σ = 161253000. Its totient is φ = 35643888.

The previous prime is 87791413. The next prime is 87791443. The reversal of 87791438 is 83419778.

It is a super-2 number, since 2×87791438² = 15414673172215688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87791392 and 87791401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21713 + ... + 25436.

It is an arithmetic number, because the mean of its divisors is an integer number (6718875).

Almost surely, 2^87791438 is an apocalyptic number.

87791438 is a deficient number, since it is larger than the sum of its proper divisors (73461562).

87791438 is a wasteful number, since it uses less digits than its factorization.

87791438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47184 (or 47177 counting only the distinct ones).

The product of its digits is 338688, while the sum is 47.

The square root of 87791438 is about 9369.7085333536. The cubic root of 87791438 is about 444.4443479213. Note that the first 3 decimals are identical.

The spelling of 87791438 in words is "eighty-seven million, seven hundred ninety-one thousand, four hundred thirty-eight".