2621401920 has 224 divisors, whose sum is σ = 9324441600. Its totient is φ = 693245952.

The previous prime is 2621401907. The next prime is 2621401927. The reversal of 2621401920 is 291041262.

2621401920 is a `hidden beast` number, since 2 + 621 + 4 + 0 + 19 + 20 = 666.

2621401920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2621401927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1096086 + ... + 1098474.

Almost surely, 2^2621401920 is an apocalyptic number.

2621401920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2621401920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4662220800).

2621401920 is an abundant number, since it is smaller than the sum of its proper divisors (6703039680).

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

2621401920 is a wasteful number, since it uses less digits than its factorization.

2621401920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2542 (or 2526 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 2621401920 is about 51199.6281236495. The cubic root of 2621401920 is about 1378.8315250847.

The spelling of 2621401920 in words is "two billion, six hundred twenty-one million, four hundred one thousand, nine hundred twenty".