78172352 has 14 divisors (see below), whose sum is σ = 155123388. Its totient is φ = 39086144.

The previous prime is 78172351. The next prime is 78172357. The reversal of 78172352 is 25327187.

It is a super-2 number, since 2×78172352² = 12221833234423808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78172351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610658 + ... + 610785.

It is an arithmetic number, because the mean of its divisors is an integer number (11080242).

Almost surely, 2^78172352 is an apocalyptic number.

It is an amenable number.

78172352 is a deficient number, since it is larger than the sum of its proper divisors (76951036).

78172352 is a wasteful number, since it uses less digits than its factorization.

78172352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221455 (or 1221445 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 78172352 is about 8841.5129926953. The cubic root of 78172352 is about 427.5803380586.

The spelling of 78172352 in words is "seventy-eight million, one hundred seventy-two thousand, three hundred fifty-two".