2639880 has 48 divisors (see below), whose sum is σ = 8580780. Its totient is φ = 703872.

The previous prime is 2639873. The next prime is 2639881. The reversal of 2639880 is 889362.

It can be written as a sum of positive squares in 2 ways, for example, as 2196324 + 443556 = 1482^2 + 666^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (2639881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3307 + ... + 4026.

2^2639880 is an apocalyptic number.

2639880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2639880 is an abundant number, since it is smaller than the sum of its proper divisors (5940900).

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

2639880 is a wasteful number, since it uses less digits than its factorization.

2639880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7350 (or 7343 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 2639880 is about 1624.7707530603. The cubic root of 2639880 is about 138.2063705008.

The spelling of 2639880 in words is "two million, six hundred thirty-nine thousand, eight hundred eighty".