772020789 has 4 divisors (see below), whose sum is σ = 1029361056. Its totient is φ = 514680524.

The previous prime is 772020751. The next prime is 772020791. The reversal of 772020789 is 987020277.

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, and also an emirpimes, since its reverse is a distinct semiprime: 987020277 = 3 ⋅329006759.

It is a cyclic number.

It is not a de Polignac number, because 772020789 - 2⁷ = 772020661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 772020789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (772020709) 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, 128670129 + ... + 128670134.

It is an arithmetic number, because the mean of its divisors is an integer number (257340264).

Almost surely, 2^772020789 is an apocalyptic number.

It is an amenable number.

772020789 is a deficient number, since it is larger than the sum of its proper divisors (257340267).

772020789 is a wasteful number, since it uses less digits than its factorization.

772020789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257340266.

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 772020789 is about 27785.2620826221. The cubic root of 772020789 is about 917.3667570518.

The spelling of 772020789 in words is "seven hundred seventy-two million, twenty thousand, seven hundred eighty-nine".