2780662640 has 160 divisors (see below), whose sum is σ = 7625511936. Its totient is φ = 923166720.

The previous prime is 2780662627. The next prime is 2780662669. The reversal of 2780662640 is 462660872.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3742109 + ... + 3742851.

Almost surely, 2^2780662640 is an apocalyptic number.

2780662640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2780662640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3812755968).

2780662640 is an abundant number, since it is smaller than the sum of its proper divisors (4844849296).

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

2780662640 is a wasteful number, since it uses less digits than its factorization.

2780662640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967 (or 961 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 2780662640 is about 52731.9887734191. The cubic root of 2780662640 is about 1406.2075778742.

The spelling of 2780662640 in words is "two billion, seven hundred eighty million, six hundred sixty-two thousand, six hundred forty".