2640655290 has 128 divisors (see below), whose sum is σ = 7876657152. Its totient is φ = 551681280.

The previous prime is 2640655279. The next prime is 2640655333. The reversal of 2640655290 is 925560462.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 276495 + ... + 285885.

It is an arithmetic number, because the mean of its divisors is an integer number (61536384).

Almost surely, 2^2640655290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2640655290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3938328576).

2640655290 is an abundant number, since it is smaller than the sum of its proper divisors (5236001862).

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

2640655290 is a wasteful number, since it uses less digits than its factorization.

2640655290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9524.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 2640655290 is about 51387.3067011689. The cubic root of 2640655290 is about 1382.1989883412.

The spelling of 2640655290 in words is "two billion, six hundred forty million, six hundred fifty-five thousand, two hundred ninety".