64144731 has 16 divisors (see below), whose sum is σ = 97959168. Its totient is φ = 36573600.

The previous prime is 64144727. The next prime is 64144739. The reversal of 64144731 is 13744146.

It is not a de Polignac number, because 64144731 - 2² = 64144727 is a prime.

It is a super-2 number, since 2×64144731² = 8229093030124722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64144739) 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, 7201 + ... + 13421.

It is an arithmetic number, because the mean of its divisors is an integer number (6122448).

Almost surely, 2^64144731 is an apocalyptic number.

64144731 is a deficient number, since it is larger than the sum of its proper divisors (33814437).

64144731 is a wasteful number, since it uses less digits than its factorization.

64144731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6722.

The product of its digits is 8064, while the sum is 30.

The square root of 64144731 is about 8009.0405792454. The cubic root of 64144731 is about 400.3012959116.

Adding to 64144731 its reverse (13744146), we get a palindrome (77888877).

The spelling of 64144731 in words is "sixty-four million, one hundred forty-four thousand, seven hundred thirty-one".