78722152 has 8 divisors (see below), whose sum is σ = 147604050. Its totient is φ = 39361072.

The previous prime is 78722141. The next prime is 78722159. The reversal of 78722152 is 25122787.

It can be written as a sum of positive squares in only one way, i.e., 63776196 + 14945956 = 7986^2 + 3866^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×78722152² = 12394354431022208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78722159) 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 as a sum of consecutive naturals, namely, 4920127 + ... + 4920142.

Almost surely, 2^78722152 is an apocalyptic number.

It is an amenable number.

78722152 is a deficient number, since it is larger than the sum of its proper divisors (68881898).

78722152 is a wasteful number, since it uses less digits than its factorization.

78722152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9840275 (or 9840271 counting only the distinct ones).

The product of its digits is 15680, while the sum is 34.

The square root of 78722152 is about 8872.5504788646. The cubic root of 78722152 is about 428.5804132296.

The spelling of 78722152 in words is "seventy-eight million, seven hundred twenty-two thousand, one hundred fifty-two".