1722222640 has 20 divisors (see below), whose sum is σ = 4004167824. Its totient is φ = 688889024.

The previous prime is 1722222631. The next prime is 1722222653. The reversal of 1722222640 is 462222271.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 1722222599 and 1722222608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10763812 + ... + 10763971.

Almost surely, 2^1722222640 is an apocalyptic number.

1722222640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1722222640 is an abundant number, since it is smaller than the sum of its proper divisors (2281945184).

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

1722222640 is a wasteful number, since it uses less digits than its factorization.

1722222640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21527796 (or 21527790 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 1722222640 is about 41499.6703601366. The cubic root of 1722222640 is about 1198.6611549486.

The spelling of 1722222640 in words is "one billion, seven hundred twenty-two million, two hundred twenty-two thousand, six hundred forty".