87666399 has 48 divisors (see below), whose sum is σ = 144050400. Its totient is φ = 51038208.

The previous prime is 87666373. The next prime is 87666407. The reversal of 87666399 is 99366678.

It is a happy number.

It is not a de Polignac number, because 87666399 - 2⁸ = 87666143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87666349) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 153787 + ... + 154355.

It is an arithmetic number, because the mean of its divisors is an integer number (3001050).

Almost surely, 2^87666399 is an apocalyptic number.

87666399 is a deficient number, since it is larger than the sum of its proper divisors (56384001).

87666399 is a wasteful number, since it uses less digits than its factorization.

87666399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 661 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 87666399 is about 9363.0336430027. The cubic root of 87666399 is about 444.2332442623.

The spelling of 87666399 in words is "eighty-seven million, six hundred sixty-six thousand, three hundred ninety-nine".