64651738 has 8 divisors (see below), whose sum is σ = 97401780. Its totient is φ = 32184480.

The previous prime is 64651733. The next prime is 64651739. The reversal of 64651738 is 83715646.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 64048009 + 603729 = 8003^2 + 777^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 64651738.

It is not an unprimeable number, because it can be changed into a prime (64651733) 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, 70123 + ... + 71038.

Almost surely, 2^64651738 is an apocalyptic number.

64651738 is a deficient number, since it is larger than the sum of its proper divisors (32750042).

64651738 is a wasteful number, since it uses less digits than its factorization.

64651738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141392.

The product of its digits is 120960, while the sum is 40.

The square root of 64651738 is about 8040.6304479189. The cubic root of 64651738 is about 401.3532044320.

It can be divided in two parts, 6465 and 1738, that multiplied together give a triangular number (11236170 = T₄₇₄₀).

The spelling of 64651738 in words is "sixty-four million, six hundred fifty-one thousand, seven hundred thirty-eight".