64309806 has 36 divisors (see below), whose sum is σ = 153161736. Its totient is φ = 19487160.

The previous prime is 64309787. The next prime is 64309807. The reversal of 64309806 is 60890346.

64309806 is a `hidden beast` number, since 643 + 0 + 9 + 8 + 0 + 6 = 666.

It is a super-2 number, since 2×64309806² = 8271502295515272, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64309807) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12586 + ... + 16941.

Almost surely, 2^64309806 is an apocalyptic number.

64309806 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

64309806 is an abundant number, since it is smaller than the sum of its proper divisors (88851930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64309806 is a wasteful number, since it uses less digits than its factorization.

64309806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29557 (or 29543 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 64309806 is about 8019.3394989862. The cubic root of 64309806 is about 400.6443905114.

It can be divided in two parts, 6 and 4309806, that multiplied together give a triangular number (25858836 = T₇₁₉₁).

The spelling of 64309806 in words is "sixty-four million, three hundred nine thousand, eight hundred six".