773890221 has 32 divisors (see below), whose sum is σ = 1140506752. Its totient is φ = 463760640.

The previous prime is 773890219. The next prime is 773890237. The reversal of 773890221 is 122098377.

It is not a de Polignac number, because 773890221 - 2¹ = 773890219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 773890221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (773890291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 906831 + ... + 907683.

It is an arithmetic number, because the mean of its divisors is an integer number (35640836).

Almost surely, 2^773890221 is an apocalyptic number.

It is an amenable number.

773890221 is a deficient number, since it is larger than the sum of its proper divisors (366616531).

773890221 is a wasteful number, since it uses less digits than its factorization.

773890221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 773890221 is about 27818.8824541893. The cubic root of 773890221 is about 918.1066215791.

The spelling of 773890221 in words is "seven hundred seventy-three million, eight hundred ninety thousand, two hundred twenty-one".