77374621 has 2 divisors, whose sum is σ = 77374622. Its totient is φ = 77374620.

The previous prime is 77374613. The next prime is 77374637. The reversal of 77374621 is 12647377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70795396 + 6579225 = 8414^2 + 2565^2 .

It is a cyclic number.

It is not a de Polignac number, because 77374621 - 2³ = 77374613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77374601) 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, 38687310 + 38687311.

It is an arithmetic number, because the mean of its divisors is an integer number (38687311).

Almost surely, 2^77374621 is an apocalyptic number.

It is an amenable number.

77374621 is a deficient number, since it is larger than the sum of its proper divisors (1).

77374621 is an equidigital number, since it uses as much as digits as its factorization.

77374621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 37.

The square root of 77374621 is about 8796.2844997192. The cubic root of 77374621 is about 426.1209091287.

The spelling of 77374621 in words is "seventy-seven million, three hundred seventy-four thousand, six hundred twenty-one".