8172040644 has 48 divisors (see below), whose sum is σ = 21485197440. Its totient is φ = 2685644640.

The previous prime is 8172040627. The next prime is 8172040661. The reversal of 8172040644 is 4460402718.

8172040644 is a `hidden beast` number, since 8 + 1 + 7 + 2 + 0 + 4 + 0 + 644 = 666.

It is an interprime number because it is at equal distance from previous prime (8172040627) and next prime (8172040661).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 8172040599 and 8172040608.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 525199 + ... + 540534.

It is an arithmetic number, because the mean of its divisors is an integer number (447608280).

Almost surely, 2^8172040644 is an apocalyptic number.

It is an amenable number.

8172040644 is an abundant number, since it is smaller than the sum of its proper divisors (13313156796).

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

8172040644 is a wasteful number, since it uses less digits than its factorization.

8172040644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065817 (or 1065809 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 8172040644 is about 90399.3398427223. The cubic root of 8172040644 is about 2014.2351600582.

The spelling of 8172040644 in words is "eight billion, one hundred seventy-two million, forty thousand, six hundred forty-four".