82404591844 has 27 divisors (see below), whose sum is σ = 153207997257. Its totient is φ = 38774038464.

The previous prime is 82404591811. The next prime is 82404591931. The reversal of 82404591844 is 44819540428.

The square root of 82404591844 is 287062.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 64155824100 + 18248767744 = 253290^2 + 135088^2 .

It is a super-4 number, since 4×82404591844⁴ (a number of 45 digits) contains 4444 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9755887 + ... + 9764329.

Almost surely, 2^82404591844 is an apocalyptic number.

82404591844 is the 287062-nd square number.

It is an amenable number.

82404591844 is a deficient number, since it is larger than the sum of its proper divisors (70803405413).

82404591844 is an frugal number, since it uses more digits than its factorization.

82404591844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16924 (or 8462 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 49.

Multiplying 82404591844 by its sum of digits (49), we get a square (4037825000356 = 2009434²).

The spelling of 82404591844 in words is "eighty-two billion, four hundred four million, five hundred ninety-one thousand, eight hundred forty-four".