64273520 has 40 divisors (see below), whose sum is σ = 149979984. Its totient is φ = 25615872.

The previous prime is 64273513. The next prime is 64273529. The reversal of 64273520 is 2537246.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64273529) 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, 23252 + ... + 25868.

Almost surely, 2^64273520 is an apocalyptic number.

It is an amenable number.

64273520 is an abundant number, since it is smaller than the sum of its proper divisors (85706464).

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

64273520 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (64273519) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (2937).

64273520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2937 (or 2931 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 64273520 is about 8017.0767739869. The cubic root of 64273520 is about 400.5690234802.

The spelling of 64273520 in words is "sixty-four million, two hundred seventy-three thousand, five hundred twenty".