8125215644 has 24 divisors (see below), whose sum is σ = 17500465248. Its totient is φ = 3214370880.

The previous prime is 8125215643. The next prime is 8125215697. The reversal of 8125215644 is 4465125218.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 8125215598 and 8125215607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8125215643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11160647 + ... + 11161374.

It is an arithmetic number, because the mean of its divisors is an integer number (729186052).

Almost surely, 2^8125215644 is an apocalyptic number.

It is an amenable number.

8125215644 is an abundant number, since it is smaller than the sum of its proper divisors (9375249604).

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

8125215644 is a wasteful number, since it uses less digits than its factorization.

8125215644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22322045 (or 22322043 counting only the distinct ones).

The product of its digits is 76800, while the sum is 38.

The square root of 8125215644 is about 90139.9780563541. The cubic root of 8125215644 is about 2010.3806646836.

The spelling of 8125215644 in words is "eight billion, one hundred twenty-five million, two hundred fifteen thousand, six hundred forty-four".