64807561 has 8 divisors (see below), whose sum is σ = 79763264. Its totient is φ = 51276240.

The previous prime is 64807549. The next prime is 64807573. The reversal of 64807561 is 16570846.

It is an interprime number because it is at equal distance from previous prime (64807549) and next prime (64807573).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64807561 - 2⁵ = 64807529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64807561.

It is not an unprimeable number, because it can be changed into a prime (64807531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355995 + ... + 356176.

It is an arithmetic number, because the mean of its divisors is an integer number (9970408).

Almost surely, 2^64807561 is an apocalyptic number.

It is an amenable number.

64807561 is a deficient number, since it is larger than the sum of its proper divisors (14955703).

64807561 is a wasteful number, since it uses less digits than its factorization.

64807561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712191.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 64807561 is about 8050.3143416888. The cubic root of 64807561 is about 401.6753916101.

It can be divided in two parts, 6480 and 7561, that added together give a palindrome (14041).

The spelling of 64807561 in words is "sixty-four million, eight hundred seven thousand, five hundred sixty-one".