87791140 has 12 divisors (see below), whose sum is σ = 184361436. Its totient is φ = 35116448.

The previous prime is 87791131. The next prime is 87791141. The reversal of 87791140 is 4119778.

It can be written as a sum of positive squares in 2 ways, for example, as 13003236 + 74787904 = 3606^2 + 8648^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 87791140.

It is not an unprimeable number, because it can be changed into a prime (87791141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2194759 + ... + 2194798.

It is an arithmetic number, because the mean of its divisors is an integer number (15363453).

Almost surely, 2^87791140 is an apocalyptic number.

It is an amenable number.

87791140 is an abundant number, since it is smaller than the sum of its proper divisors (96570296).

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

87791140 is a wasteful number, since it uses less digits than its factorization.

87791140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4389566 (or 4389564 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 87791140 is about 9369.6926310312. The cubic root of 87791140 is about 444.4438450455.

The spelling of 87791140 in words is "eighty-seven million, seven hundred ninety-one thousand, one hundred forty".