87919772 has 6 divisors (see below), whose sum is σ = 153859608. Its totient is φ = 43959884.

The previous prime is 87919771. The next prime is 87919787. The reversal of 87919772 is 27791978.

It is a self number, because there is not a number n which added to its sum of digits gives 87919772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87919771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10989968 + ... + 10989975.

It is an arithmetic number, because the mean of its divisors is an integer number (25643268).

Almost surely, 2^87919772 is an apocalyptic number.

It is an amenable number.

87919772 is a deficient number, since it is larger than the sum of its proper divisors (65939836).

87919772 is a wasteful number, since it uses less digits than its factorization.

87919772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21979947 (or 21979945 counting only the distinct ones).

The product of its digits is 444528, while the sum is 50.

The square root of 87919772 is about 9376.5543778085. The cubic root of 87919772 is about 444.6608062013.

The spelling of 87919772 in words is "eighty-seven million, nine hundred nineteen thousand, seven hundred seventy-two".