2978978197972 has 72 divisors (see below), whose sum is σ = 6100218432000. Its totient is φ = 1269162437760.

The previous prime is 2978978197969. The next prime is 2978978198003. The reversal of 2978978197972 is 2797918798792.

It is a super-2 number, since 2×2978978197972² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2978978197972.

It is a congruent number.

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, 56988904 + ... + 57041152.

It is an arithmetic number, because the mean of its divisors is an integer number (84725256000).

Almost surely, 2^{2978978197972} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2978978197972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3050109216000).

2978978197972 is an abundant number, since it is smaller than the sum of its proper divisors (3121240234028).

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

2978978197972 is a wasteful number, since it uses less digits than its factorization.

2978978197972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53981 (or 53972 counting only the distinct ones).

The product of its digits is 4032758016, while the sum is 85.

The spelling of 2978978197972 in words is "two trillion, nine hundred seventy-eight billion, nine hundred seventy-eight million, one hundred ninety-seven thousand, nine hundred seventy-two".