428690521 has 16 divisors (see below), whose sum is σ = 527718400. Its totient is φ = 340009488.

The previous prime is 428690497. The next prime is 428690533. The reversal of 428690521 is 125096824.

It is not a de Polignac number, because 428690521 - 2¹³ = 428682329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428690551) 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, 31761 + ... + 43198.

It is an arithmetic number, because the mean of its divisors is an integer number (32982400).

Almost surely, 2^428690521 is an apocalyptic number.

It is an amenable number.

428690521 is a deficient number, since it is larger than the sum of its proper divisors (99027879).

428690521 is a wasteful number, since it uses less digits than its factorization.

428690521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75028.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 428690521 is about 20704.8429358930. The cubic root of 428690521 is about 754.0172708861.

The spelling of 428690521 in words is "four hundred twenty-eight million, six hundred ninety thousand, five hundred twenty-one".