64561401 has 32 divisors (see below), whose sum is σ = 98409600. Its totient is φ = 41817600.

The previous prime is 64561397. The next prime is 64561403. The reversal of 64561401 is 10416546.

64561401 is a `hidden beast` number, since 6 + 45 + 614 + 0 + 1 = 666.

It is not a de Polignac number, because 64561401 - 2² = 64561397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64561403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160801 + ... + 161201.

It is an arithmetic number, because the mean of its divisors is an integer number (3075300).

Almost surely, 2^64561401 is an apocalyptic number.

It is an amenable number.

64561401 is a deficient number, since it is larger than the sum of its proper divisors (33848199).

64561401 is a wasteful number, since it uses less digits than its factorization.

64561401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566 (or 560 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 64561401 is about 8035.0109520772. The cubic root of 64561401 is about 401.1661821605.

Adding to 64561401 its reverse (10416546), we get a palindrome (74977947).

The spelling of 64561401 in words is "sixty-four million, five hundred sixty-one thousand, four hundred one".