87776540 has 12 divisors (see below), whose sum is σ = 184330776. Its totient is φ = 35110608.

The previous prime is 87776539. The next prime is 87776581. The reversal of 87776540 is 4567778.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 87776491 and 87776500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2194394 + ... + 2194433.

It is an arithmetic number, because the mean of its divisors is an integer number (15360898).

Almost surely, 2^87776540 is an apocalyptic number.

It is an amenable number.

87776540 is an abundant number, since it is smaller than the sum of its proper divisors (96554236).

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

87776540 is a wasteful number, since it uses less digits than its factorization.

87776540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4388836 (or 4388834 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 44.

The square root of 87776540 is about 9368.9134909017. The cubic root of 87776540 is about 444.4192061131.

The spelling of 87776540 in words is "eighty-seven million, seven hundred seventy-six thousand, five hundred forty".