64539737 has 4 divisors (see below), whose sum is σ = 66621696. Its totient is φ = 62457780.

The previous prime is 64539719. The next prime is 64539763. The reversal of 64539737 is 73793546.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73793546 = 2 ⋅36896773.

It is a cyclic number.

It is not a de Polignac number, because 64539737 - 2²⁴ = 47762521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64539767) 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, 1040933 + ... + 1040994.

It is an arithmetic number, because the mean of its divisors is an integer number (16655424).

Almost surely, 2^64539737 is an apocalyptic number.

It is an amenable number.

64539737 is a deficient number, since it is larger than the sum of its proper divisors (2081959).

64539737 is a wasteful number, since it uses less digits than its factorization.

64539737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2081958.

The product of its digits is 476280, while the sum is 44.

The square root of 64539737 is about 8033.6627387512. The cubic root of 64539737 is about 401.1213058292.

The spelling of 64539737 in words is "sixty-four million, five hundred thirty-nine thousand, seven hundred thirty-seven".