2639620 has 24 divisors (see below), whose sum is σ = 5580288. Its totient is φ = 1048800.

The previous prime is 2639597. The next prime is 2639633. The reversal of 2639620 is 269362.

It is a d-powerful number, because it can be written as 2¹³ + 6⁴ + 3⁵ + 9⁶ + 6⁴ + 2²¹ + 0 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3475 + ... + 4165.

It is an arithmetic number, because the mean of its divisors is an integer number (232512).

2^2639620 is an apocalyptic number.

2639620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2639620 is an abundant number, since it is smaller than the sum of its proper divisors (2940668).

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

2639620 is a wasteful number, since it uses less digits than its factorization.

2639620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891 (or 889 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 2639620 is about 1624.6907398025. The cubic root of 2639620 is about 138.2018330678.

The spelling of 2639620 in words is "two million, six hundred thirty-nine thousand, six hundred twenty".