42764721 has 8 divisors (see below), whose sum is σ = 57954624. Its totient is φ = 28042320.

The previous prime is 42764699. The next prime is 42764723. The reversal of 42764721 is 12746724.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42764721 - 2⁹ = 42764209 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42764723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116661 + ... + 117026.

It is an arithmetic number, because the mean of its divisors is an integer number (7244328).

Almost surely, 2^42764721 is an apocalyptic number.

It is an amenable number.

42764721 is a deficient number, since it is larger than the sum of its proper divisors (15189903).

42764721 is a wasteful number, since it uses less digits than its factorization.

42764721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233751.

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

The square root of 42764721 is about 6539.4740614211. The cubic root of 42764721 is about 349.6996634420.

The spelling of 42764721 in words is "forty-two million, seven hundred sixty-four thousand, seven hundred twenty-one".