87212925 has 18 divisors (see below), whose sum is σ = 156208442. Its totient is φ = 46513440.

The previous prime is 87212903. The next prime is 87212927. The reversal of 87212925 is 52921278.

It can be written as a sum of positive squares in 3 ways, for example, as 27815076 + 59397849 = 5274^2 + 7707^2 .

It is not a de Polignac number, because 87212925 - 2⁶ = 87212861 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87212925.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87212927) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 193582 + ... + 194031.

Almost surely, 2^87212925 is an apocalyptic number.

It is an amenable number.

87212925 is a deficient number, since it is larger than the sum of its proper divisors (68995517).

87212925 is a wasteful number, since it uses less digits than its factorization.

87212925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387629 (or 387621 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 87212925 is about 9338.7860560139. The cubic root of 87212925 is about 443.4659545692.

The spelling of 87212925 in words is "eighty-seven million, two hundred twelve thousand, nine hundred twenty-five".