1722904890 has 64 divisors (see below), whose sum is σ = 4731678720. Its totient is φ = 393307200.

The previous prime is 1722904879. The next prime is 1722904891. The reversal of 1722904890 is 984092271.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1722904891) 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, 175615 + ... + 185165.

It is an arithmetic number, because the mean of its divisors is an integer number (73932480).

Almost surely, 2^1722904890 is an apocalyptic number.

1722904890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1722904890 is an abundant number, since it is smaller than the sum of its proper divisors (3008773830).

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

1722904890 is a wasteful number, since it uses less digits than its factorization.

1722904890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10427.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 1722904890 is about 41507.8894910353. The cubic root of 1722904890 is about 1198.8194152862.

The spelling of 1722904890 in words is "one billion, seven hundred twenty-two million, nine hundred four thousand, eight hundred ninety".