64148721 has 16 divisors (see below), whose sum is σ = 105270144. Its totient is φ = 33836544.

The previous prime is 64148671. The next prime is 64148729. The reversal of 64148721 is 12784146.

It is not a de Polignac number, because 64148721 - 2⁹ = 64148209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64148729) 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, 117216 + ... + 117761.

It is an arithmetic number, because the mean of its divisors is an integer number (6579384).

Almost surely, 2^64148721 is an apocalyptic number.

It is an amenable number.

64148721 is a deficient number, since it is larger than the sum of its proper divisors (41121423).

64148721 is a wasteful number, since it uses less digits than its factorization.

64148721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235000.

The product of its digits is 10752, while the sum is 33.

The square root of 64148721 is about 8009.2896688783. The cubic root of 64148721 is about 400.3095957311.

It can be divided in two parts, 64 and 148721, that added together give a triangular number (148785 = T₅₄₅).

The spelling of 64148721 in words is "sixty-four million, one hundred forty-eight thousand, seven hundred twenty-one".