64981263 has 4 divisors (see below), whose sum is σ = 86641688. Its totient is φ = 43320840.

The previous prime is 64981253. The next prime is 64981289. The reversal of 64981263 is 36218946.

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

It is not a de Polignac number, because 64981263 - 2²¹ = 62884111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64981253) 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, 10830208 + ... + 10830213.

It is an arithmetic number, because the mean of its divisors is an integer number (21660422).

Almost surely, 2^64981263 is an apocalyptic number.

64981263 is a deficient number, since it is larger than the sum of its proper divisors (21660425).

64981263 is a wasteful number, since it uses less digits than its factorization.

64981263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21660424.

The product of its digits is 62208, while the sum is 39.

The square root of 64981263 is about 8061.0956451341. The cubic root of 64981263 is about 402.0339381263.

The spelling of 64981263 in words is "sixty-four million, nine hundred eighty-one thousand, two hundred sixty-three".