85615820 has 24 divisors (see below), whose sum is σ = 180278784. Its totient is φ = 34153856.

The previous prime is 85615819. The next prime is 85615841. The reversal of 85615820 is 2851658.

It is a happy number.

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, 2072 + ... + 13248.

It is an arithmetic number, because the mean of its divisors is an integer number (7511616).

Almost surely, 2^85615820 is an apocalyptic number.

It is an amenable number.

85615820 is an abundant number, since it is smaller than the sum of its proper divisors (94662964).

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

85615820 is a wasteful number, since it uses less digits than its factorization.

85615820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11569 (or 11567 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 85615820 is about 9252.8817132826. The cubic root of 85615820 is about 440.7422389436.

The spelling of 85615820 in words is "eighty-five million, six hundred fifteen thousand, eight hundred twenty".