2640625278480 has 400 divisors, whose sum is σ = 10484225288064. Its totient is φ = 603412623360.

The previous prime is 2640625278479. The next prime is 2640625278481. The reversal of 2640625278480 is 848725260462.

2640625278480 is a `hidden beast` number, since 2 + 6 + 4 + 0 + 625 + 2 + 7 + 8 + 4 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (2640625278479) and next prime (2640625278481).

It is a super-2 number, since 2×2640625278480² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (2640625278481) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 315746779 + ... + 315755141.

Almost surely, 2^{2640625278480} is an apocalyptic number.

2640625278480 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 2640625278480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5242112644032).

2640625278480 is an abundant number, since it is smaller than the sum of its proper divisors (7843600009584).

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

2640625278480 is a wasteful number, since it uses less digits than its factorization.

2640625278480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15356 (or 15341 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 54.

The spelling of 2640625278480 in words is "two trillion, six hundred forty billion, six hundred twenty-five million, two hundred seventy-eight thousand, four hundred eighty".