64774993 has 2 divisors, whose sum is σ = 64774994. Its totient is φ = 64774992.

The previous prime is 64774987. The next prime is 64774999. The reversal of 64774993 is 39947746.

It is a balanced prime because it is at equal distance from previous prime (64774987) and next prime (64774999).

It can be written as a sum of positive squares in only one way, i.e., 62837329 + 1937664 = 7927^2 + 1392^2 .

It is a cyclic number.

It is not a de Polignac number, because 64774993 - 2⁹ = 64774481 is a prime.

It is not a weakly prime, because it can be changed into another prime (64774999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32387496 + 32387497.

It is an arithmetic number, because the mean of its divisors is an integer number (32387497).

Almost surely, 2^64774993 is an apocalyptic number.

It is an amenable number.

64774993 is a deficient number, since it is larger than the sum of its proper divisors (1).

64774993 is an equidigital number, since it uses as much as digits as its factorization.

64774993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 49.

The square root of 64774993 is about 8048.2913093401. The cubic root of 64774993 is about 401.6080951614.

The spelling of 64774993 in words is "sixty-four million, seven hundred seventy-four thousand, nine hundred ninety-three".