172827720 has 96 divisors (see below), whose sum is σ = 604913400. Its totient is φ = 42541056.

The previous prime is 172827709. The next prime is 172827731. The reversal of 172827720 is 27728271.

It is an interprime number because it is at equal distance from previous prime (172827709) and next prime (172827731).

It can be written as a sum of positive squares in 4 ways, for example, as 127103076 + 45724644 = 11274^2 + 6762^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13785 + ... + 23144.

Almost surely, 2^172827720 is an apocalyptic number.

172827720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172827720 is an abundant number, since it is smaller than the sum of its proper divisors (432085680).

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

172827720 is a wasteful number, since it uses less digits than its factorization.

172827720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36959 (or 36952 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The square root of 172827720 is about 13146.3957037661. The cubic root of 172827720 is about 557.0204419694.

The spelling of 172827720 in words is "one hundred seventy-two million, eight hundred twenty-seven thousand, seven hundred twenty".