64620261 has 24 divisors (see below), whose sum is σ = 97179264. Its totient is φ = 42910560.

The previous prime is 64620251. The next prime is 64620277. The reversal of 64620261 is 16202646.

It is a happy number.

It is not a de Polignac number, because 64620261 - 2⁵ = 64620229 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 (64620211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104425 + ... + 105041.

It is an arithmetic number, because the mean of its divisors is an integer number (4049136).

Almost surely, 2^64620261 is an apocalyptic number.

It is an amenable number.

64620261 is a deficient number, since it is larger than the sum of its proper divisors (32559003).

64620261 is an equidigital number, since it uses as much as digits as its factorization.

64620261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063 (or 1051 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 64620261 is about 8038.6728382240. The cubic root of 64620261 is about 401.2880582296.

The spelling of 64620261 in words is "sixty-four million, six hundred twenty thousand, two hundred sixty-one".