64791644 has 48 divisors (see below), whose sum is σ = 123197760. Its totient is φ = 29736960.

The previous prime is 64791637. The next prime is 64791647. The reversal of 64791644 is 44619746.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64791647) 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, 335612 + ... + 335804.

It is an arithmetic number, because the mean of its divisors is an integer number (2566620).

Almost surely, 2^64791644 is an apocalyptic number.

It is an amenable number.

64791644 is a deficient number, since it is larger than the sum of its proper divisors (58406116).

64791644 is a wasteful number, since it uses less digits than its factorization.

64791644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 348 counting only the distinct ones).

The product of its digits is 145152, while the sum is 41.

The square root of 64791644 is about 8049.3256860435. The cubic root of 64791644 is about 401.6425045487.

The spelling of 64791644 in words is "sixty-four million, seven hundred ninety-one thousand, six hundred forty-four".