64372993 has 4 divisors (see below), whose sum is σ = 65943108. Its totient is φ = 62802880.

The previous prime is 64372991. The next prime is 64373017. The reversal of 64372993 is 39927346.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38850289 + 25522704 = 6233^2 + 5052^2 .

It is a cyclic number.

It is not a de Polignac number, because 64372993 - 2¹ = 64372991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64372991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 784996 + ... + 785077.

It is an arithmetic number, because the mean of its divisors is an integer number (16485777).

Almost surely, 2^64372993 is an apocalyptic number.

It is an amenable number.

64372993 is a deficient number, since it is larger than the sum of its proper divisors (1570115).

64372993 is a wasteful number, since it uses less digits than its factorization.

64372993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570114.

The product of its digits is 244944, while the sum is 43.

The square root of 64372993 is about 8023.2781953513. The cubic root of 64372993 is about 400.7755640292.

The spelling of 64372993 in words is "sixty-four million, three hundred seventy-two thousand, nine hundred ninety-three".