2920000781 has 8 divisors (see below), whose sum is σ = 2937643800. Its totient is φ = 2902374720.

The previous prime is 2920000777. The next prime is 2920000823. The reversal of 2920000781 is 1870000292.

It is a happy number.

2920000781 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 4 ways, for example, as 2920681 + 2917080100 = 1709^2 + 54010^2 .

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 2920000781 - 2² = 2920000777 is a prime.

It is a super-2 number, since 2×2920000781² = 17052809122081219922, 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 (2920000751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 560135 + ... + 565323.

It is an arithmetic number, because the mean of its divisors is an integer number (367205475).

Almost surely, 2^2920000781 is an apocalyptic number.

It is an amenable number.

2920000781 is a deficient number, since it is larger than the sum of its proper divisors (17643019).

2920000781 is a wasteful number, since it uses less digits than its factorization.

2920000781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8479.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 2920000781 is about 54037.0315709514. The cubic root of 2920000781 is about 1429.3140271938.

The spelling of 2920000781 in words is "two billion, nine hundred twenty million, seven hundred eighty-one", and thus it is an aban number.