78252973 has 2 divisors, whose sum is σ = 78252974. Its totient is φ = 78252972.

The previous prime is 78252961. The next prime is 78253003. The reversal of 78252973 is 37925287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57486724 + 20766249 = 7582^2 + 4557^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78252973 is a prime.

It is a super-2 number, since 2×78252973² = 12247055566677458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78252913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39126486 + 39126487.

It is an arithmetic number, because the mean of its divisors is an integer number (39126487).

Almost surely, 2^78252973 is an apocalyptic number.

It is an amenable number.

78252973 is a deficient number, since it is larger than the sum of its proper divisors (1).

78252973 is an equidigital number, since it uses as much as digits as its factorization.

78252973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 43.

The square root of 78252973 is about 8846.0710487764. The cubic root of 78252973 is about 427.7272788024.

The spelling of 78252973 in words is "seventy-eight million, two hundred fifty-two thousand, nine hundred seventy-three".