2662640 has 40 divisors (see below), whose sum is σ = 6280848. Its totient is φ = 1049600.

The previous prime is 2662607. The next prime is 2662651. The reversal of 2662640 is 462662.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6440 + ... + 6840.

2^2662640 is an apocalyptic number.

2662640 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 2662640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3140424).

2662640 is an abundant number, since it is smaller than the sum of its proper divisors (3618208).

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

2662640 is a wasteful number, since it uses less digits than its factorization.

2662640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497 (or 491 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 2662640 is about 1631.7597862431. The cubic root of 2662640 is about 138.6024213405.

The spelling of 2662640 in words is "two million, six hundred sixty-two thousand, six hundred forty".