2621247620 has 24 divisors (see below), whose sum is σ = 5509194264. Its totient is φ = 1047627776.

The previous prime is 2621247613. The next prime is 2621247641. The reversal of 2621247620 is 267421262.

It can be written as a sum of positive squares in 4 ways, for example, as 502118464 + 2119129156 = 22408^2 + 46034^2 .

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, 29507 + ... + 78186.

It is an arithmetic number, because the mean of its divisors is an integer number (229549761).

Almost surely, 2^2621247620 is an apocalyptic number.

2621247620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2621247620 is an abundant number, since it is smaller than the sum of its proper divisors (2887946644).

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

2621247620 is a wasteful number, since it uses less digits than its factorization.

2621247620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108919 (or 108917 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 2621247620 is about 51198.1212545929. The cubic root of 2621247620 is about 1378.8044711285.

Adding to 2621247620 its reverse (267421262), we get a palindrome (2888668882).

The spelling of 2621247620 in words is "two billion, six hundred twenty-one million, two hundred forty-seven thousand, six hundred twenty".