172730120664 has 32 divisors (see below), whose sum is σ = 431944251120. Its totient is φ = 57560846976.

The previous prime is 172730120657. The next prime is 172730120669. The reversal of 172730120664 is 466021037271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172730120669) 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, 902139 + ... + 1076714.

Almost surely, 2^172730120664 is an apocalyptic number.

It is an amenable number.

172730120664 is an abundant number, since it is smaller than the sum of its proper divisors (259214130456).

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

172730120664 is a wasteful number, since it uses less digits than its factorization.

172730120664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982499 (or 1982495 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 39.

The spelling of 172730120664 in words is "one hundred seventy-two billion, seven hundred thirty million, one hundred twenty thousand, six hundred sixty-four".