2640428461 has 8 divisors (see below), whose sum is σ = 3032071200. Its totient is φ = 2274053040.

The previous prime is 2640428429. The next prime is 2640428471. The reversal of 2640428461 is 1648240462.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2640428461 - 2⁵ = 2640428429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2640428461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640428471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6316606 + ... + 6317023.

It is an arithmetic number, because the mean of its divisors is an integer number (379008900).

Almost surely, 2^2640428461 is an apocalyptic number.

It is an amenable number.

2640428461 is a deficient number, since it is larger than the sum of its proper divisors (391642739).

2640428461 is a wasteful number, since it uses less digits than its factorization.

2640428461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12633659.

The product of its (nonzero) digits is 73728, while the sum is 37.

The square root of 2640428461 is about 51385.0996009544. The cubic root of 2640428461 is about 1382.1594108175.

The spelling of 2640428461 in words is "two billion, six hundred forty million, four hundred twenty-eight thousand, four hundred sixty-one".