2639764 has 6 divisors (see below), whose sum is σ = 4619594. Its totient is φ = 1319880.

The previous prime is 2639761. The next prime is 2639773. The reversal of 2639764 is 4679362.

It can be written as a sum of positive squares in only one way, i.e., 2160900 + 478864 = 1470^2 + 692^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329967 + ... + 329974.

2^2639764 is an apocalyptic number.

It is an amenable number.

2639764 is a deficient number, since it is larger than the sum of its proper divisors (1979830).

2639764 is a wasteful number, since it uses less digits than its factorization.

2639764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659945 (or 659943 counting only the distinct ones).

The product of its digits is 54432, while the sum is 37.

The square root of 2639764 is about 1624.7350553244. The cubic root of 2639764 is about 138.2043461445.

It can be divided in two parts, 2639 and 764, that added together give a triangular number (3403 = T₈₂).

The spelling of 2639764 in words is "two million, six hundred thirty-nine thousand, seven hundred sixty-four".