2640126540 has 48 divisors (see below), whose sum is σ = 7403649120. Its totient is φ = 702958080.

The previous prime is 2640126539. The next prime is 2640126581. The reversal of 2640126540 is 456210462.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2640126498 and 2640126507.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6376 + ... + 72944.

It is an arithmetic number, because the mean of its divisors is an integer number (154242690).

Almost surely, 2^2640126540 is an apocalyptic number.

2640126540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2640126540 is an abundant number, since it is smaller than the sum of its proper divisors (4763522580).

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

2640126540 is a wasteful number, since it uses less digits than its factorization.

2640126540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67242 (or 67240 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 2640126540 is about 51382.1616906101. The cubic root of 2640126540 is about 1382.1067275928.

The spelling of 2640126540 in words is "two billion, six hundred forty million, one hundred twenty-six thousand, five hundred forty".