87970664 has 8 divisors (see below), whose sum is σ = 164945010. Its totient is φ = 43985328.

The previous prime is 87970661. The next prime is 87970667. The reversal of 87970664 is 46607978.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (87970661) and next prime (87970667).

It can be written as a sum of positive squares in only one way, i.e., 66422500 + 21548164 = 8150^2 + 4642^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (87970661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5498159 + ... + 5498174.

Almost surely, 2^87970664 is an apocalyptic number.

It is an amenable number.

87970664 is a deficient number, since it is larger than the sum of its proper divisors (76974346).

87970664 is a wasteful number, since it uses less digits than its factorization.

87970664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10996339 (or 10996335 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 87970664 is about 9379.2677752584. The cubic root of 87970664 is about 444.7465863479.

The spelling of 87970664 in words is "eighty-seven million, nine hundred seventy thousand, six hundred sixty-four".