1858728613 has 6 divisors (see below), whose sum is σ = 2162194566. Its totient is φ = 1593195912.

The previous prime is 1858728587. The next prime is 1858728617. The reversal of 1858728613 is 3168278581.

It can be written as a sum of positive squares in only one way, i.e., 1432016964 + 426711649 = 37842^2 + 20657^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1858728613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 37933237 = 1858728613 / (1 + 8 + 5 + 8 + 7 + 2 + 8 + 6 + 1 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1858728617) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18966570 + ... + 18966667.

It is an arithmetic number, because the mean of its divisors is an integer number (360365761).

Almost surely, 2^1858728613 is an apocalyptic number.

It is an amenable number.

1858728613 is a deficient number, since it is larger than the sum of its proper divisors (303465953).

1858728613 is an equidigital number, since it uses as much as digits as its factorization.

1858728613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37933251 (or 37933244 counting only the distinct ones).

The product of its digits is 645120, while the sum is 49.

The square root of 1858728613 is about 43112.9749959336. The cubic root of 1858728613 is about 1229.5286741530.

The spelling of 1858728613 in words is "one billion, eight hundred fifty-eight million, seven hundred twenty-eight thousand, six hundred thirteen".