2631978260 has 12 divisors (see below), whose sum is σ = 5527154388. Its totient is φ = 1052791296.

The previous prime is 2631978257. The next prime is 2631978269. The reversal of 2631978260 is 628791362.

It can be written as a sum of positive squares in 2 ways, for example, as 489028996 + 2142949264 = 22114^2 + 46292^2 .

It is a super-2 number, since 2×2631978260² = 13854619122225255200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2631978269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65799437 + ... + 65799476.

It is an arithmetic number, because the mean of its divisors is an integer number (460596199).

Almost surely, 2^2631978260 is an apocalyptic number.

2631978260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2631978260 is an abundant number, since it is smaller than the sum of its proper divisors (2895176128).

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

2631978260 is a wasteful number, since it uses less digits than its factorization.

2631978260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131598922 (or 131598920 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 2631978260 is about 51302.8094747257. The cubic root of 2631978260 is about 1380.6833869333.

The spelling of 2631978260 in words is "two billion, six hundred thirty-one million, nine hundred seventy-eight thousand, two hundred sixty".