2621334978 has 48 divisors (see below), whose sum is σ = 5993170560. Its totient is φ = 826385472.

The previous prime is 2621334949. The next prime is 2621335037. The reversal of 2621334978 is 8794331262.

2621334978 is a `hidden beast` number, since 26 + 2 + 133 + 497 + 8 = 666.

2621334978 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1275 + ... + 72417.

It is an arithmetic number, because the mean of its divisors is an integer number (124857720).

Almost surely, 2^2621334978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2621334978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2996585280).

2621334978 is an abundant number, since it is smaller than the sum of its proper divisors (3371835582).

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

2621334978 is a wasteful number, since it uses less digits than its factorization.

2621334978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71263 (or 71260 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 2621334978 is about 51198.9743842589. The cubic root of 2621334978 is about 1378.8197880412.

The spelling of 2621334978 in words is "two billion, six hundred twenty-one million, three hundred thirty-four thousand, nine hundred seventy-eight".