78264737 has 2 divisors, whose sum is σ = 78264738. Its totient is φ = 78264736.

The previous prime is 78264727. The next prime is 78264757. The reversal of 78264737 is 73746287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41589601 + 36675136 = 6449^2 + 6056^2 .

It is a cyclic number.

It is not a de Polignac number, because 78264737 - 2⁶ = 78264673 is a prime.

It is a super-2 number, since 2×78264737² = 12250738115358338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78264727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39132368 + 39132369.

It is an arithmetic number, because the mean of its divisors is an integer number (39132369).

Almost surely, 2^78264737 is an apocalyptic number.

It is an amenable number.

78264737 is a deficient number, since it is larger than the sum of its proper divisors (1).

78264737 is an equidigital number, since it uses as much as digits as its factorization.

78264737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 44.

The square root of 78264737 is about 8846.7359517508. The cubic root of 78264737 is about 427.7487115624.

The spelling of 78264737 in words is "seventy-eight million, two hundred sixty-four thousand, seven hundred thirty-seven".