64880261 has 4 divisors (see below), whose sum is σ = 64915500. Its totient is φ = 64845024.

The previous prime is 64880227. The next prime is 64880273. The reversal of 64880261 is 16208846.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23522500 + 41357761 = 4850^2 + 6431^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64880261 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 (64880201) 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, 14696 + ... + 18593.

It is an arithmetic number, because the mean of its divisors is an integer number (16228875).

Almost surely, 2^64880261 is an apocalyptic number.

It is an amenable number.

64880261 is a deficient number, since it is larger than the sum of its proper divisors (35239).

64880261 is a wasteful number, since it uses less digits than its factorization.

64880261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35238.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 64880261 is about 8054.8284277196. The cubic root of 64880261 is about 401.8255329822.

The spelling of 64880261 in words is "sixty-four million, eight hundred eighty thousand, two hundred sixty-one".