172730390 has 24 divisors (see below), whose sum is σ = 361677312. Its totient is φ = 59221680.

The previous prime is 172730377. The next prime is 172730423. The reversal of 172730390 is 93037271.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 175766 + ... + 176745.

It is an arithmetic number, because the mean of its divisors is an integer number (15069888).

Almost surely, 2^172730390 is an apocalyptic number.

172730390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172730390 is an abundant number, since it is smaller than the sum of its proper divisors (188946922).

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

172730390 is a wasteful number, since it uses less digits than its factorization.

172730390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352532 (or 352525 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 172730390 is about 13142.6934073652. The cubic root of 172730390 is about 556.9158580905.

The spelling of 172730390 in words is "one hundred seventy-two million, seven hundred thirty thousand, three hundred ninety".