77207993 has 2 divisors, whose sum is σ = 77207994. Its totient is φ = 77207992.

The previous prime is 77207989. The next prime is 77208031. The reversal of 77207993 is 39970277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64513024 + 12694969 = 8032^2 + 3563^2 .

It is an emirp because it is prime and its reverse (39970277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77207993 - 2² = 77207989 is a prime.

It is a super-2 number, since 2×77207993² = 11922148366176098, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77207953) 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, 38603996 + 38603997.

It is an arithmetic number, because the mean of its divisors is an integer number (38603997).

Almost surely, 2^77207993 is an apocalyptic number.

It is an amenable number.

77207993 is a deficient number, since it is larger than the sum of its proper divisors (1).

77207993 is an equidigital number, since it uses as much as digits as its factorization.

77207993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 166698, while the sum is 44.

The square root of 77207993 is about 8786.8078959313. The cubic root of 77207993 is about 425.8148022755.

The spelling of 77207993 in words is "seventy-seven million, two hundred seven thousand, nine hundred ninety-three".