172079680 has 28 divisors (see below), whose sum is σ = 409765500. Its totient is φ = 68831744.

The previous prime is 172079671. The next prime is 172079683. The reversal of 172079680 is 86970271.

It can be written as a sum of positive squares in 2 ways, for example, as 42302016 + 129777664 = 6504^2 + 11392^2 .

It is a super-2 number, since 2×172079680² = 59222832537804800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (172079683) 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, 268555 + ... + 269194.

Almost surely, 2^172079680 is an apocalyptic number.

172079680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172079680 is an abundant number, since it is smaller than the sum of its proper divisors (237685820).

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

172079680 is an equidigital number, since it uses as much as digits as its factorization.

172079680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537766 (or 537756 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 172079680 is about 13117.9144683902. The cubic root of 172079680 is about 556.2156401787.

The spelling of 172079680 in words is "one hundred seventy-two million, seventy-nine thousand, six hundred eighty".