64220465 has 4 divisors (see below), whose sum is σ = 77064564. Its totient is φ = 51376368.

The previous prime is 64220461. The next prime is 64220467. The reversal of 64220465 is 56402246.

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 44568976 + 19651489 = 6676^2 + 4433^2 .

It is a cyclic number.

It is not a de Polignac number, because 64220465 - 2² = 64220461 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64220461) 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, 6422042 + ... + 6422051.

It is an arithmetic number, because the mean of its divisors is an integer number (19266141).

Almost surely, 2^64220465 is an apocalyptic number.

It is an amenable number.

64220465 is a deficient number, since it is larger than the sum of its proper divisors (12844099).

64220465 is a wasteful number, since it uses less digits than its factorization.

64220465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12844098.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 64220465 is about 8013.7672164844. The cubic root of 64220465 is about 400.4587756943.

The spelling of 64220465 in words is "sixty-four million, two hundred twenty thousand, four hundred sixty-five".