64783669 has 4 divisors (see below), whose sum is σ = 64931680. Its totient is φ = 64635660.

The previous prime is 64783661. The next prime is 64783687. The reversal of 64783669 is 96638746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64783669 - 2³ = 64783661 is a prime.

It is a super-2 number, since 2×64783669² = 8393847538203122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64783661) 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, 73347 + ... + 74224.

It is an arithmetic number, because the mean of its divisors is an integer number (16232920).

Almost surely, 2^64783669 is an apocalyptic number.

It is an amenable number.

64783669 is a deficient number, since it is larger than the sum of its proper divisors (148011).

64783669 is a wasteful number, since it uses less digits than its factorization.

64783669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148010.

The product of its digits is 1306368, while the sum is 49.

The square root of 64783669 is about 8048.8302876878. The cubic root of 64783669 is about 401.6260249010.

The spelling of 64783669 in words is "sixty-four million, seven hundred eighty-three thousand, six hundred sixty-nine".