721992222 has 24 divisors (see below), whose sum is σ = 1787790576. Its totient is φ = 206283456.

The previous prime is 721992217. The next prime is 721992233. The reversal of 721992222 is 222299127.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2864923 + ... + 2865174.

It is an arithmetic number, because the mean of its divisors is an integer number (74491274).

Almost surely, 2^721992222 is an apocalyptic number.

721992222 is an abundant number, since it is smaller than the sum of its proper divisors (1065798354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721992222 is a wasteful number, since it uses less digits than its factorization.

721992222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5730112 (or 5730109 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 721992222 is about 26869.9129511057. The cubic root of 721992222 is about 897.1068503566.

The spelling of 721992222 in words is "seven hundred twenty-one million, nine hundred ninety-two thousand, two hundred twenty-two".