428403613 has 4 divisors (see below), whose sum is σ = 467349408. Its totient is φ = 389457820.

The previous prime is 428403581. The next prime is 428403623. The reversal of 428403613 is 316304824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 428403613 - 2⁵ = 428403581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428403623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19472881 + ... + 19472902.

It is an arithmetic number, because the mean of its divisors is an integer number (116837352).

Almost surely, 2^428403613 is an apocalyptic number.

428403613 is the 11064-th centered heptagonal number.

It is an amenable number.

428403613 is a deficient number, since it is larger than the sum of its proper divisors (38945795).

428403613 is a wasteful number, since it uses less digits than its factorization.

428403613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38945794.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 428403613 is about 20697.9132523064. The cubic root of 428403613 is about 753.8490206325.

The spelling of 428403613 in words is "four hundred twenty-eight million, four hundred three thousand, six hundred thirteen".