64749872 has 120 divisors (see below), whose sum is σ = 155317440. Its totient is φ = 25850880.

The previous prime is 64749869. The next prime is 64749911. The reversal of 64749872 is 27894746.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 966383 + ... + 966449.

It is an arithmetic number, because the mean of its divisors is an integer number (1294312).

Almost surely, 2^64749872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64749872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77658720).

64749872 is an abundant number, since it is smaller than the sum of its proper divisors (90567568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64749872 is a wasteful number, since it uses less digits than its factorization.

64749872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 116 counting only the distinct ones).

The product of its digits is 677376, while the sum is 47.

The square root of 64749872 is about 8046.7305161786. The cubic root of 64749872 is about 401.5561713094.

The spelling of 64749872 in words is "sixty-four million, seven hundred forty-nine thousand, eight hundred seventy-two".