172020378 has 8 divisors (see below), whose sum is σ = 344040768. Its totient is φ = 57340124.

The previous prime is 172020371. The next prime is 172020383. The reversal of 172020378 is 873020271.

It is a sphenic number, since it is the product of 3 distinct primes.

172020378 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (172020371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14335026 + ... + 14335037.

It is an arithmetic number, because the mean of its divisors is an integer number (43005096).

Almost surely, 2^172020378 is an apocalyptic number.

172020378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

172020378 is a wasteful number, since it uses less digits than its factorization.

172020378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28670068.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 172020378 is about 13115.6539295607. The cubic root of 172020378 is about 556.1517385999.

It can be divided in two parts, 17202037 and 8, that added together give a triangular number (17202045 = T₅₈₆₅).

The spelling of 172020378 in words is "one hundred seventy-two million, twenty thousand, three hundred seventy-eight".