64406739 has 16 divisors (see below), whose sum is σ = 90542592. Its totient is φ = 40643328.

The previous prime is 64406729. The next prime is 64406743. The reversal of 64406739 is 93760446.

It is not a de Polignac number, because 64406739 - 2⁵ = 64406707 is a prime.

It is a super-2 number, since 2×64406739² = 8296456057228242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64406697 and 64406706.

It is not an unprimeable number, because it can be changed into a prime (64406729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1882 + ... + 11504.

It is an arithmetic number, because the mean of its divisors is an integer number (5658912).

Almost surely, 2^64406739 is an apocalyptic number.

64406739 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

64406739 is a deficient number, since it is larger than the sum of its proper divisors (26135853).

64406739 is a wasteful number, since it uses less digits than its factorization.

64406739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9746.

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 64406739 is about 8025.3809255387. The cubic root of 64406739 is about 400.8455841258.

The spelling of 64406739 in words is "sixty-four million, four hundred six thousand, seven hundred thirty-nine".