78352772 has 6 divisors (see below), whose sum is σ = 137117358. Its totient is φ = 39176384.

The previous prime is 78352739. The next prime is 78352787. The reversal of 78352772 is 27725387.

It can be written as a sum of positive squares in only one way, i.e., 61246276 + 17106496 = 7826^2 + 4136^2 .

It is a super-2 number, since 2×78352772² = 12278313760167968, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 9794093 + ... + 9794100.

It is an arithmetic number, because the mean of its divisors is an integer number (22852893).

Almost surely, 2^78352772 is an apocalyptic number.

It is an amenable number.

78352772 is a deficient number, since it is larger than the sum of its proper divisors (58764586).

78352772 is a wasteful number, since it uses less digits than its factorization.

78352772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19588197 (or 19588195 counting only the distinct ones).

The product of its digits is 164640, while the sum is 41.

The square root of 78352772 is about 8851.7101172598. The cubic root of 78352772 is about 427.9090338601.

The spelling of 78352772 in words is "seventy-eight million, three hundred fifty-two thousand, seven hundred seventy-two".