2639772 has 18 divisors (see below), whose sum is σ = 6672848. Its totient is φ = 879912.

The previous prime is 2639761. The next prime is 2639773. The reversal of 2639772 is 2779362.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 73327 = 2639772 / (2 + 6 + 3 + 9 + 7 + 7 + 2).

It is a d-powerful number, because it can be written as 2¹³ + 6³ + 3³ + 9⁶ + 7³ + 7⁴ + 2²¹ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639773) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36628 + ... + 36699.

2^2639772 is an apocalyptic number.

It is an amenable number.

2639772 is an abundant number, since it is smaller than the sum of its proper divisors (4033076).

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

2639772 is a wasteful number, since it uses less digits than its factorization.

2639772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73337 (or 73332 counting only the distinct ones).

The product of its digits is 31752, while the sum is 36.

The square root of 2639772 is about 1624.7375172624. The cubic root of 2639772 is about 138.2044857572.

The spelling of 2639772 in words is "two million, six hundred thirty-nine thousand, seven hundred seventy-two".