2897856673920 has 640 divisors, whose sum is σ = 11159340192000. Its totient is φ = 712390090752.

The previous prime is 2897856673903. The next prime is 2897856673949. The reversal of 2897856673920 is 293766587982.

2897856673920 is a `hidden beast` number, since 2 + 8 + 9 + 7 + 8 + 566 + 7 + 39 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 619330141 + ... + 619334819.

It is an arithmetic number, because the mean of its divisors is an integer number (17436469050).

Almost surely, 2^{2897856673920} is an apocalyptic number.

2897856673920 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 2897856673920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5579670096000).

2897856673920 is an abundant number, since it is smaller than the sum of its proper divisors (8261483518080).

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

2897856673920 is a wasteful number, since it uses less digits than its factorization.

2897856673920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5642 (or 5621 counting only the distinct ones).

The product of its (nonzero) digits is 548674560, while the sum is 72.

The spelling of 2897856673920 in words is "two trillion, eight hundred ninety-seven billion, eight hundred fifty-six million, six hundred seventy-three thousand, nine hundred twenty".