64723730 has 16 divisors (see below), whose sum is σ = 119652120. Its totient is φ = 25189632.

The previous prime is 64723727. The next prime is 64723739. The reversal of 64723730 is 3732746.

It can be written as a sum of positive squares in 4 ways, for example, as 64657681 + 66049 = 8041^2 + 257^2 .

It is a super-2 number, since 2×64723730² = 8378322450225800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64723739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87095 + ... + 87834.

Almost surely, 2^64723730 is an apocalyptic number.

64723730 is a deficient number, since it is larger than the sum of its proper divisors (54928390).

64723730 is a wasteful number, since it uses less digits than its factorization.

64723730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174973.

The product of its (nonzero) digits is 21168, while the sum is 32.

The square root of 64723730 is about 8045.1059657409. The cubic root of 64723730 is about 401.5021228396.

The spelling of 64723730 in words is "sixty-four million, seven hundred twenty-three thousand, seven hundred thirty".