2780078797 has 4 divisors (see below), whose sum is σ = 2781716800. Its totient is φ = 2778440796.

The previous prime is 2780078773. The next prime is 2780078887. The reversal of 2780078797 is 7978700872.

It is a happy number.

2780078797 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2780078797 - 2⁷ = 2780078669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2780078737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816453 + ... + 819850.

It is an arithmetic number, because the mean of its divisors is an integer number (695429200).

Almost surely, 2^2780078797 is an apocalyptic number.

It is an amenable number.

2780078797 is a deficient number, since it is larger than the sum of its proper divisors (1638003).

2780078797 is a wasteful number, since it uses less digits than its factorization.

2780078797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638002.

The product of its (nonzero) digits is 2765952, while the sum is 55.

The square root of 2780078797 is about 52726.4525357055. The cubic root of 2780078797 is about 1406.1091526635.

The spelling of 2780078797 in words is "two billion, seven hundred eighty million, seventy-eight thousand, seven hundred ninety-seven".