64433969 has 4 divisors (see below), whose sum is σ = 66655860. Its totient is φ = 62212080.

The previous prime is 64433947. The next prime is 64433987. The reversal of 64433969 is 96933446.

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 36481600 + 27952369 = 6040^2 + 5287^2 .

It is a cyclic number.

It is not a de Polignac number, because 64433969 - 2⁸ = 64433713 is a prime.

It is a super-2 number, since 2×64433969² = 8303472722185922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64433939) 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, 1110902 + ... + 1110959.

It is an arithmetic number, because the mean of its divisors is an integer number (16663965).

Almost surely, 2^64433969 is an apocalyptic number.

It is an amenable number.

64433969 is a deficient number, since it is larger than the sum of its proper divisors (2221891).

64433969 is a wasteful number, since it uses less digits than its factorization.

64433969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221890.

The product of its digits is 419904, while the sum is 44.

The square root of 64433969 is about 8027.0772389457. The cubic root of 64433969 is about 400.9020662453.

The spelling of 64433969 in words is "sixty-four million, four hundred thirty-three thousand, nine hundred sixty-nine".