2904660781 has 6 divisors (see below), whose sum is σ = 3192726446. Its totient is φ = 2640600600.

The previous prime is 2904660767. The next prime is 2904660791. The reversal of 2904660781 is 1870664092.

2904660781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1660970025 + 1243690756 = 40755^2 + 35266^2 .

It is not a de Polignac number, because 2904660781 - 2⁷ = 2904660653 is a prime.

It is a super-2 number, since 2×2904660781² = 16874108505359059922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2904660721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12002610 + ... + 12002851.

Almost surely, 2^2904660781 is an apocalyptic number.

It is an amenable number.

2904660781 is a deficient number, since it is larger than the sum of its proper divisors (288065665).

2904660781 is a wasteful number, since it uses less digits than its factorization.

2904660781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24005483 (or 24005472 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 2904660781 is about 53894.9049632709. The cubic root of 2904660781 is about 1426.8067008572.

The spelling of 2904660781 in words is "two billion, nine hundred four million, six hundred sixty thousand, seven hundred eighty-one".