64685597 has 4 divisors (see below), whose sum is σ = 64821120. Its totient is φ = 64550076.

The previous prime is 64685587. The next prime is 64685611. The reversal of 64685597 is 79558646.

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: 79558646 = 2 ⋅39779323.

It is a cyclic number.

It is not a de Polignac number, because 64685597 - 2⁴ = 64685581 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 (64685507) 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, 67043 + ... + 68000.

It is an arithmetic number, because the mean of its divisors is an integer number (16205280).

Almost surely, 2^64685597 is an apocalyptic number.

It is an amenable number.

64685597 is a deficient number, since it is larger than the sum of its proper divisors (135523).

64685597 is a wasteful number, since it uses less digits than its factorization.

64685597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135522.

The product of its digits is 1814400, while the sum is 50.

The square root of 64685597 is about 8042.7356664259. The cubic root of 64685597 is about 401.4232569263.

The spelling of 64685597 in words is "sixty-four million, six hundred eighty-five thousand, five hundred ninety-seven".