77953957 has 2 divisors, whose sum is σ = 77953958. Its totient is φ = 77953956.

The previous prime is 77953951. The next prime is 77953991. The reversal of 77953957 is 75935977.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77545636 + 408321 = 8806^2 + 639^2 .

It is a cyclic number.

It is not a de Polignac number, because 77953957 - 2³ = 77953949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77953951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38976978 + 38976979.

It is an arithmetic number, because the mean of its divisors is an integer number (38976979).

Almost surely, 2^77953957 is an apocalyptic number.

It is an amenable number.

77953957 is a deficient number, since it is larger than the sum of its proper divisors (1).

77953957 is an equidigital number, since it uses as much as digits as its factorization.

77953957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2083725, while the sum is 52.

The square root of 77953957 is about 8829.1538099639. The cubic root of 77953957 is about 427.1817806719.

The spelling of 77953957 in words is "seventy-seven million, nine hundred fifty-three thousand, nine hundred fifty-seven".