2621995940 has 24 divisors (see below), whose sum is σ = 5596459512. Its totient is φ = 1031604480.

The previous prime is 2621995939. The next prime is 2621995967. The reversal of 2621995940 is 495991262.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 222367744 + 2399628196 = 14912^2 + 48986^2 .

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1073369 + ... + 1075808.

It is an arithmetic number, because the mean of its divisors is an integer number (233185813).

Almost surely, 2^2621995940 is an apocalyptic number.

2621995940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2621995940 is an abundant number, since it is smaller than the sum of its proper divisors (2974463572).

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

2621995940 is a wasteful number, since it uses less digits than its factorization.

2621995940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149247 (or 2149245 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 2621995940 is about 51205.4288137498. The cubic root of 2621995940 is about 1378.9356667703.

The spelling of 2621995940 in words is "two billion, six hundred twenty-one million, nine hundred ninety-five thousand, nine hundred forty".