172879720 has 32 divisors (see below), whose sum is σ = 418902120. Its totient is φ = 63832320.

The previous prime is 172879699. The next prime is 172879807. The reversal of 172879720 is 27978271.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 92275236 + 80604484 = 9606^2 + 8978^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165711 + ... + 166750.

Almost surely, 2^172879720 is an apocalyptic number.

172879720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172879720 is an abundant number, since it is smaller than the sum of its proper divisors (246022400).

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

172879720 is a wasteful number, since it uses less digits than its factorization.

172879720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332485 (or 332481 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 172879720 is about 13148.3732834142. The cubic root of 172879720 is about 557.0763013699.

The spelling of 172879720 in words is "one hundred seventy-two million, eight hundred seventy-nine thousand, seven hundred twenty".