82501640 has 32 divisors (see below), whose sum is σ = 199909080. Its totient is φ = 30461952.

The previous prime is 82501631. The next prime is 82501669. The reversal of 82501640 is 4610528.

It can be written as a sum of positive squares in 4 ways, for example, as 66357316 + 16144324 = 8146^2 + 4018^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78809 + ... + 79848.

Almost surely, 2^82501640 is an apocalyptic number.

It is an amenable number.

82501640 is an abundant number, since it is smaller than the sum of its proper divisors (117407440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82501640 is a wasteful number, since it uses less digits than its factorization.

82501640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158681 (or 158677 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 82501640 is about 9083.0413408726. The cubic root of 82501640 is about 435.3322691464.

The spelling of 82501640 in words is "eighty-two million, five hundred one thousand, six hundred forty".