6720813231 has 24 divisors (see below), whose sum is σ = 9857202432. Its totient is φ = 4070154000.

The previous prime is 6720813173. The next prime is 6720813301. The reversal of 6720813231 is 1323180276.

It is not a de Polignac number, because 6720813231 - 2¹⁰ = 6720812207 is a prime.

It is a super-2 number, since 2×6720813231² = 90338660971969318722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 6720813192 and 6720813201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720811231) 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, 533556 + ... + 546006.

It is an arithmetic number, because the mean of its divisors is an integer number (410716768).

Almost surely, 2^6720813231 is an apocalyptic number.

6720813231 is a deficient number, since it is larger than the sum of its proper divisors (3136389201).

6720813231 is a wasteful number, since it uses less digits than its factorization.

6720813231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13963 (or 13952 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 6720813231 is about 81980.5661788207. The cubic root of 6720813231 is about 1887.1537115758.

The spelling of 6720813231 in words is "six billion, seven hundred twenty million, eight hundred thirteen thousand, two hundred thirty-one".