64686769 has 4 divisors (see below), whose sum is σ = 73927744. Its totient is φ = 55445796.

The previous prime is 64686761. The next prime is 64686793. The reversal of 64686769 is 96768646.

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 not a de Polignac number, because 64686769 - 2³ = 64686761 is a prime.

It is a super-2 number, since 2×64686769² = 8368756167318722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64686761) 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, 4620477 + ... + 4620490.

It is an arithmetic number, because the mean of its divisors is an integer number (18481936).

Almost surely, 2^64686769 is an apocalyptic number.

It is an amenable number.

64686769 is a deficient number, since it is larger than the sum of its proper divisors (9240975).

64686769 is an equidigital number, since it uses as much as digits as its factorization.

64686769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9240974.

The product of its digits is 2612736, while the sum is 52.

The square root of 64686769 is about 8042.8085268767. The cubic root of 64686769 is about 401.4256812950.

The spelling of 64686769 in words is "sixty-four million, six hundred eighty-six thousand, seven hundred sixty-nine".