172722730 has 32 divisors (see below), whose sum is σ = 328224960. Its totient is φ = 65260800.

The previous prime is 172722727. The next prime is 172722733. The reversal of 172722730 is 37227271.

It is an interprime number because it is at equal distance from previous prime (172722727) and next prime (172722733).

It is a junction number, because it is equal to n+sod(n) for n = 172722692 and 172722701.

It is not an unprimeable number, because it can be changed into a prime (172722733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75057 + ... + 77323.

It is an arithmetic number, because the mean of its divisors is an integer number (10257030).

Almost surely, 2^172722730 is an apocalyptic number.

172722730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172722730 is a deficient number, since it is larger than the sum of its proper divisors (155502230).

172722730 is a wasteful number, since it uses less digits than its factorization.

172722730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2694.

The product of its (nonzero) digits is 8232, while the sum is 31.

The square root of 172722730 is about 13142.4019874603. The cubic root of 172722730 is about 556.9076255331.

It can be divided in two parts, 17272 and 2730, that added together give a palindrome (20002).

The spelling of 172722730 in words is "one hundred seventy-two million, seven hundred twenty-two thousand, seven hundred thirty".