2691320544 has 72 divisors (see below), whose sum is σ = 8349220152. Its totient is φ = 815550720.

The previous prime is 2691320539. The next prime is 2691320557. The reversal of 2691320544 is 4450231962.

It is a happy number.

2691320544 is a `hidden beast` number, since 2 + 6 + 91 + 3 + 20 + 544 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2691320499 and 2691320508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 421599 + ... + 427934.

It is an arithmetic number, because the mean of its divisors is an integer number (115961391).

Almost surely, 2^2691320544 is an apocalyptic number.

2691320544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2691320544 is an abundant number, since it is smaller than the sum of its proper divisors (5657899608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2691320544 is a wasteful number, since it uses less digits than its factorization.

2691320544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849560 (or 849549 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 2691320544 is about 51877.9388950641. The cubic root of 2691320544 is about 1390.9829570549.

The spelling of 2691320544 in words is "two billion, six hundred ninety-one million, three hundred twenty thousand, five hundred forty-four".