2278688664 has 32 divisors (see below), whose sum is σ = 6510539520. Its totient is φ = 651053856.

The previous prime is 2278688663. The next prime is 2278688681. The reversal of 2278688664 is 4668868722.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2278688663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6781644 + ... + 6781979.

It is an arithmetic number, because the mean of its divisors is an integer number (203454360).

Almost surely, 2^2278688664 is an apocalyptic number.

2278688664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2278688664 is an abundant number, since it is smaller than the sum of its proper divisors (4231850856).

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

2278688664 is a wasteful number, since it uses less digits than its factorization.

2278688664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13563639 (or 13563635 counting only the distinct ones).

The product of its digits is 12386304, while the sum is 57.

The square root of 2278688664 is about 47735.6121150656. The cubic root of 2278688664 is about 1315.9164943025.

The spelling of 2278688664 in words is "two billion, two hundred seventy-eight million, six hundred eighty-eight thousand, six hundred sixty-four".