87881388 has 24 divisors (see below), whose sum is σ = 234350592. Its totient is φ = 25108944.

The previous prime is 87881377. The next prime is 87881389. The reversal of 87881388 is 88318878.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 87881388.

It is not an unprimeable number, because it can be changed into a prime (87881389) 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, 523020 + ... + 523187.

It is an arithmetic number, because the mean of its divisors is an integer number (9764608).

Almost surely, 2^87881388 is an apocalyptic number.

It is an amenable number.

87881388 is an abundant number, since it is smaller than the sum of its proper divisors (146469204).

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

87881388 is a wasteful number, since it uses less digits than its factorization.

87881388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046221 (or 1046219 counting only the distinct ones).

The product of its digits is 688128, while the sum is 51.

The square root of 87881388 is about 9374.5073470556. The cubic root of 87881388 is about 444.5960868008.

The spelling of 87881388 in words is "eighty-seven million, eight hundred eighty-one thousand, three hundred eighty-eight".