2947172640 has 96 divisors (see below), whose sum is σ = 9337519296. Its totient is φ = 781347840.

The previous prime is 2947172621. The next prime is 2947172653. The reversal of 2947172640 is 462717492.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 2947172592 and 2947172601.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65295 + ... + 100785.

It is an arithmetic number, because the mean of its divisors is an integer number (97265826).

Almost surely, 2^2947172640 is an apocalyptic number.

2947172640 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 2947172640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4668759648).

2947172640 is an abundant number, since it is smaller than the sum of its proper divisors (6390346656).

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

2947172640 is a wasteful number, since it uses less digits than its factorization.

2947172640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35682 (or 35674 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 2947172640 is about 54287.8682580188. The cubic root of 2947172640 is about 1433.7338060113.

The spelling of 2947172640 in words is "two billion, nine hundred forty-seven million, one hundred seventy-two thousand, six hundred forty".