3728494431 has 24 divisors (see below), whose sum is σ = 5687601920. Its totient is φ = 2347135056.

The previous prime is 3728494423. The next prime is 3728494433. The reversal of 3728494431 is 1344948273.

It is not a de Polignac number, because 3728494431 - 2³ = 3728494423 is a prime.

It is a super-2 number, since 2×3728494431² = 27803341443996027522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3728494433) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16986 + ... + 88008.

Almost surely, 2^3728494431 is an apocalyptic number.

3728494431 is a deficient number, since it is larger than the sum of its proper divisors (1959107489).

3728494431 is a wasteful number, since it uses less digits than its factorization.

3728494431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71355 (or 71352 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 3728494431 is about 61061.3988621289. The cubic root of 3728494431 is about 1550.6406551780.

The spelling of 3728494431 in words is "three billion, seven hundred twenty-eight million, four hundred ninety-four thousand, four hundred thirty-one".