2608655640 has 64 divisors (see below), whose sum is σ = 7829429760. Its totient is φ = 695333760.

The previous prime is 2608655557. The next prime is 2608655641. The reversal of 2608655640 is 465568062.

It is a junction number, because it is equal to n+sod(n) for n = 2608655592 and 2608655601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2608655641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432727 + ... + 438713.

It is an arithmetic number, because the mean of its divisors is an integer number (122334840).

Almost surely, 2^2608655640 is an apocalyptic number.

2608655640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2608655640 is an abundant number, since it is smaller than the sum of its proper divisors (5220774120).

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

2608655640 is a wasteful number, since it uses less digits than its factorization.

2608655640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9632 (or 9628 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The square root of 2608655640 is about 51075.0001468429. Note that the first 3 decimals coincide. The cubic root of 2608655640 is about 1376.5930872961.

The spelling of 2608655640 in words is "two billion, six hundred eight million, six hundred fifty-five thousand, six hundred forty".