2647172988 has 72 divisors (see below), whose sum is σ = 6966955632. Its totient is φ = 878874624.

The previous prime is 2647172959. The next prime is 2647172989. The reversal of 2647172988 is 8892717462.

It is a happy number.

2647172988 is a `hidden beast` number, since 26 + 471 + 72 + 9 + 88 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2647172989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 244506 + ... + 255102.

Almost surely, 2^2647172988 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 2647172988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3483477816).

2647172988 is an abundant number, since it is smaller than the sum of its proper divisors (4319782644).

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

2647172988 is a wasteful number, since it uses less digits than its factorization.

2647172988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10873 (or 10859 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 2647172988 is about 51450.6850100171. The cubic root of 2647172988 is about 1383.3352408870.

The spelling of 2647172988 in words is "two billion, six hundred forty-seven million, one hundred seventy-two thousand, nine hundred eighty-eight".