2620704781 has 4 divisors (see below), whose sum is σ = 2636397792. Its totient is φ = 2605011772.

The previous prime is 2620704743. The next prime is 2620704797. The reversal of 2620704781 is 1874070262.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2620704781 - 2⁹ = 2620704269 is a prime.

It is a super-2 number, since 2×2620704781² = 13736187098312515922, which contains 22 as substring.

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 2620704781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2620704481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7846255 + ... + 7846588.

It is an arithmetic number, because the mean of its divisors is an integer number (659099448).

Almost surely, 2^2620704781 is an apocalyptic number.

It is an amenable number.

2620704781 is a deficient number, since it is larger than the sum of its proper divisors (15693011).

2620704781 is a wasteful number, since it uses less digits than its factorization.

2620704781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15693010.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 2620704781 is about 51192.8196234589. The cubic root of 2620704781 is about 1378.7092848378.

The spelling of 2620704781 in words is "two billion, six hundred twenty million, seven hundred four thousand, seven hundred eighty-one".