2621654220 has 24 divisors (see below), whose sum is σ = 7340631984. Its totient is φ = 699107776.

The previous prime is 2621654213. The next prime is 2621654239. The reversal of 2621654220 is 224561262.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21847059 + ... + 21847178.

It is an arithmetic number, because the mean of its divisors is an integer number (305859666).

Almost surely, 2^2621654220 is an apocalyptic number.

2621654220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2621654220 is an abundant number, since it is smaller than the sum of its proper divisors (4718977764).

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

2621654220 is a wasteful number, since it uses less digits than its factorization.

2621654220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43694249 (or 43694247 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 2621654220 is about 51202.0919494507. The cubic root of 2621654220 is about 1378.8757594352.

The spelling of 2621654220 in words is "two billion, six hundred twenty-one million, six hundred fifty-four thousand, two hundred twenty".