87776538 has 16 divisors (see below), whose sum is σ = 176284416. Its totient is φ = 29136960.

The previous prime is 87776537. The next prime is 87776539. The reversal of 87776538 is 83567778.

It is an interprime number because it is at equal distance from previous prime (87776537) and next prime (87776539).

It is not an unprimeable number, because it can be changed into a prime (87776537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28906 + ... + 31797.

It is an arithmetic number, because the mean of its divisors is an integer number (11017776).

Almost surely, 2^87776538 is an apocalyptic number.

87776538 is an abundant number, since it is smaller than the sum of its proper divisors (88507878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87776538 is a wasteful number, since it uses less digits than its factorization.

87776538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60949.

The product of its digits is 1975680, while the sum is 51.

The square root of 87776538 is about 9368.9133841657. The cubic root of 87776538 is about 444.4192027377.

Subtracting from 87776538 its product of digits (1975680), we obtain a palindrome (85800858).

The spelling of 87776538 in words is "eighty-seven million, seven hundred seventy-six thousand, five hundred thirty-eight".