172940778 has 16 divisors (see below), whose sum is σ = 384312960. Its totient is φ = 57646908.

The previous prime is 172940773. The next prime is 172940791. The reversal of 172940778 is 877049271.

It is a happy number.

172940778 is a `hidden beast` number, since 172 + 9 + 407 + 78 = 666.

It is not an unprimeable number, because it can be changed into a prime (172940773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1601250 + ... + 1601357.

It is an arithmetic number, because the mean of its divisors is an integer number (24019560).

Almost surely, 2^172940778 is an apocalyptic number.

172940778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

172940778 is an abundant number, since it is smaller than the sum of its proper divisors (211372182).

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

172940778 is a wasteful number, since it uses less digits than its factorization.

172940778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3202618 (or 3202612 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 45.

The square root of 172940778 is about 13150.6949626246. The cubic root of 172940778 is about 557.1418767523.

The spelling of 172940778 in words is "one hundred seventy-two million, nine hundred forty thousand, seven hundred seventy-eight".