1858428728 has 32 divisors (see below), whose sum is σ = 3816212400. Its totient is φ = 843195648.

The previous prime is 1858428713. The next prime is 1858428743. The reversal of 1858428728 is 8278248581.

It is an interprime number because it is at equal distance from previous prime (1858428713) and next prime (1858428743).

It is a self number, because there is not a number n which added to its sum of digits gives 1858428728.

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, 145301 + ... + 157572.

Almost surely, 2^1858428728 is an apocalyptic number.

It is an amenable number.

1858428728 is an abundant number, since it is smaller than the sum of its proper divisors (1957783672).

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

1858428728 is a wasteful number, since it uses less digits than its factorization.

1858428728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302951 (or 302947 counting only the distinct ones).

The product of its digits is 2293760, while the sum is 53.

The square root of 1858428728 is about 43109.4969583269. The cubic root of 1858428728 is about 1229.4625470460.

The spelling of 1858428728 in words is "one billion, eight hundred fifty-eight million, four hundred twenty-eight thousand, seven hundred twenty-eight".