87172472644 has 12 divisors (see below), whose sum is σ = 160580870800. Its totient is φ = 41292223848.

The previous prime is 87172472641. The next prime is 87172472731. The reversal of 87172472644 is 44627427178.

It is a junction number, because it is equal to n+sod(n) for n = 87172472591 and 87172472600.

It is not an unprimeable number, because it can be changed into a prime (87172472641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 573503034 + ... + 573503185.

Almost surely, 2^87172472644 is an apocalyptic number.

It is an amenable number.

87172472644 is a deficient number, since it is larger than the sum of its proper divisors (73408398156).

87172472644 is a wasteful number, since it uses less digits than its factorization.

87172472644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147006242 (or 1147006240 counting only the distinct ones).

The product of its digits is 4214784, while the sum is 52.

The spelling of 87172472644 in words is "eighty-seven billion, one hundred seventy-two million, four hundred seventy-two thousand, six hundred forty-four".