7991445837 has 16 divisors (see below), whose sum is σ = 10837002240. Its totient is φ = 5237094192.

The previous prime is 7991445821. The next prime is 7991445877. The reversal of 7991445837 is 7385441997.

It is a happy number.

It is not a de Polignac number, because 7991445837 - 2⁴ = 7991445821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7991445817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54778 + ... + 137780.

It is an arithmetic number, because the mean of its divisors is an integer number (677312640).

Almost surely, 2^7991445837 is an apocalyptic number.

It is an amenable number.

7991445837 is a deficient number, since it is larger than the sum of its proper divisors (2845556403).

7991445837 is a wasteful number, since it uses less digits than its factorization.

7991445837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83552.

The product of its digits is 7620480, while the sum is 57.

The square root of 7991445837 is about 89394.8870853362. The cubic root of 7991445837 is about 1999.2868988569.

It can be divided in two parts, 79914 and 45837, that added together give a triangular number (125751 = T₅₀₁).

The spelling of 7991445837 in words is "seven billion, nine hundred ninety-one million, four hundred forty-five thousand, eight hundred thirty-seven".