772772021 has 8 divisors (see below), whose sum is σ = 883775424. Its totient is φ = 661920480.

The previous prime is 772772017. The next prime is 772772027. The reversal of 772772021 is 120277277.

772772021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 772772021 - 2² = 772772017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (772772027) 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, 26840 + ... + 47601.

It is an arithmetic number, because the mean of its divisors is an integer number (110471928).

Almost surely, 2^772772021 is an apocalyptic number.

It is an amenable number.

772772021 is a deficient number, since it is larger than the sum of its proper divisors (111003403).

772772021 is a wasteful number, since it uses less digits than its factorization.

772772021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75931.

The product of its (nonzero) digits is 19208, while the sum is 35.

The square root of 772772021 is about 27798.7773292280. Note that the first 3 decimals coincide. The cubic root of 772772021 is about 917.6642152989.

The spelling of 772772021 in words is "seven hundred seventy-two million, seven hundred seventy-two thousand, twenty-one".