42721764 has 24 divisors (see below), whose sum is σ = 104018880. Its totient is φ = 13621344.

The previous prime is 42721753. The next prime is 42721769. The reversal of 42721764 is 46712724.

42721764 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (42721769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77119 + ... + 77670.

It is an arithmetic number, because the mean of its divisors is an integer number (4334120).

Almost surely, 2^42721764 is an apocalyptic number.

It is an amenable number.

42721764 is an abundant number, since it is smaller than the sum of its proper divisors (61297116).

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

42721764 is a wasteful number, since it uses less digits than its factorization.

42721764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154819 (or 154817 counting only the distinct ones).

The product of its digits is 18816, while the sum is 33.

The square root of 42721764 is about 6536.1887977628. The cubic root of 42721764 is about 349.5825335527.

The spelling of 42721764 in words is "forty-two million, seven hundred twenty-one thousand, seven hundred sixty-four".