2691397280 has 192 divisors, whose sum is σ = 7569676800. Its totient is φ = 891371520.

The previous prime is 2691397249. The next prime is 2691397283. The reversal of 2691397280 is 827931962.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2691397283) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1806776 + ... + 1808264.

It is an arithmetic number, because the mean of its divisors is an integer number (39425400).

Almost surely, 2^2691397280 is an apocalyptic number.

2691397280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2691397280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3784838400).

2691397280 is an abundant number, since it is smaller than the sum of its proper divisors (4878279520).

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

2691397280 is a wasteful number, since it uses less digits than its factorization.

2691397280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607 (or 1599 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 2691397280 is about 51878.6784719889. The cubic root of 2691397280 is about 1390.9961770154.

The spelling of 2691397280 in words is "two billion, six hundred ninety-one million, three hundred ninety-seven thousand, two hundred eighty".