82661715 has 40 divisors (see below), whose sum is σ = 151013808. Its totient is φ = 43243200.

The previous prime is 82661713. The next prime is 82661731. The reversal of 82661715 is 51716628.

82661715 is a `hidden beast` number, since 8 + 26 + 617 + 15 = 666.

It is not a de Polignac number, because 82661715 - 2¹ = 82661713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 82661715.

It is not an unprimeable number, because it can be changed into a prime (82661713) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 19540 + ... + 23390.

Almost surely, 2^82661715 is an apocalyptic number.

82661715 is a deficient number, since it is larger than the sum of its proper divisors (68352093).

82661715 is a wasteful number, since it uses less digits than its factorization.

82661715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3921 (or 3912 counting only the distinct ones).

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

The square root of 82661715 is about 9091.8488218844. The cubic root of 82661715 is about 435.6136404899.

The spelling of 82661715 in words is "eighty-two million, six hundred sixty-one thousand, seven hundred fifteen".