521428695 has 8 divisors (see below), whose sum is σ = 834285936. Its totient is φ = 278095296.

The previous prime is 521428673. The next prime is 521428703. The reversal of 521428695 is 596824125.

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

It is not a de Polignac number, because 521428695 - 2⁶ = 521428631 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17380942 + ... + 17380971.

It is an arithmetic number, because the mean of its divisors is an integer number (104285742).

Almost surely, 2^521428695 is an apocalyptic number.

521428695 is a deficient number, since it is larger than the sum of its proper divisors (312857241).

521428695 is a wasteful number, since it uses less digits than its factorization.

521428695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34761921.

The product of its digits is 172800, while the sum is 42.

The square root of 521428695 is about 22834.8132245482. The cubic root of 521428695 is about 804.8809386302.

The spelling of 521428695 in words is "five hundred twenty-one million, four hundred twenty-eight thousand, six hundred ninety-five".