64812493 has 4 divisors (see below), whose sum is σ = 66564220. Its totient is φ = 63060768.

The previous prime is 64812463. The next prime is 64812511. The reversal of 64812493 is 39421846.

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 26347689 + 38464804 = 5133^2 + 6202^2 .

It is a cyclic number.

It is not a de Polignac number, because 64812493 - 2¹³ = 64804301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 1751689 = 64812493 / (6 + 4 + 8 + 1 + 2 + 4 + 9 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64812463) 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, 875808 + ... + 875881.

It is an arithmetic number, because the mean of its divisors is an integer number (16641055).

Almost surely, 2^64812493 is an apocalyptic number.

It is an amenable number.

64812493 is a deficient number, since it is larger than the sum of its proper divisors (1751727).

64812493 is a wasteful number, since it uses less digits than its factorization.

64812493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751726.

The product of its digits is 41472, while the sum is 37.

The square root of 64812493 is about 8050.6206593032. The cubic root of 64812493 is about 401.6855808161.

The spelling of 64812493 in words is "sixty-four million, eight hundred twelve thousand, four hundred ninety-three".