77294993 has 2 divisors, whose sum is σ = 77294994. Its totient is φ = 77294992.

The previous prime is 77294977. The next prime is 77295013. The reversal of 77294993 is 39949277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77228944 + 66049 = 8788^2 + 257^2 .

It is an emirp because it is prime and its reverse (39949277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77294993 - 2⁴ = 77294977 is a prime.

It is not a weakly prime, because it can be changed into another prime (77294923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38647496 + 38647497.

It is an arithmetic number, because the mean of its divisors is an integer number (38647497).

Almost surely, 2^77294993 is an apocalyptic number.

It is an amenable number.

77294993 is a deficient number, since it is larger than the sum of its proper divisors (1).

77294993 is an equidigital number, since it uses as much as digits as its factorization.

77294993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 50.

The square root of 77294993 is about 8791.7571053800. The cubic root of 77294993 is about 425.9746820164.

It can be divided in two parts, 77294 and 993, that added together give a palindrome (78287).

The spelling of 77294993 in words is "seventy-seven million, two hundred ninety-four thousand, nine hundred ninety-three".