778873121 has 16 divisors (see below), whose sum is σ = 845452608. Its totient is φ = 713275200.

The previous prime is 778873103. The next prime is 778873153. The reversal of 778873121 is 121378877.

It is a cyclic number.

It is not a de Polignac number, because 778873121 - 2¹⁴ = 778856737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (778873181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1363766 + ... + 1364336.

It is an arithmetic number, because the mean of its divisors is an integer number (52840788).

Almost surely, 2^778873121 is an apocalyptic number.

It is an amenable number.

778873121 is a deficient number, since it is larger than the sum of its proper divisors (66579487).

778873121 is a wasteful number, since it uses less digits than its factorization.

778873121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232.

The product of its digits is 131712, while the sum is 44.

The square root of 778873121 is about 27908.2984253788. The cubic root of 778873121 is about 920.0728994691.

The spelling of 778873121 in words is "seven hundred seventy-eight million, eight hundred seventy-three thousand, one hundred twenty-one".