172890428890 has 8 divisors (see below), whose sum is σ = 311202772020. Its totient is φ = 69156171552.

The previous prime is 172890428863. The next prime is 172890428939. The reversal of 172890428890 is 98824098271.

It can be written as a sum of positive squares in 2 ways, for example, as 172883818849 + 6610041 = 415793^2 + 2571^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×172890428890² (a number of 23 digits) contains 22 as substring.

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, 8644521435 + ... + 8644521454.

Almost surely, 2^172890428890 is an apocalyptic number.

172890428890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172890428890 is a deficient number, since it is larger than the sum of its proper divisors (138312343130).

172890428890 is a wasteful number, since it uses less digits than its factorization.

172890428890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17289042896.

The product of its (nonzero) digits is 4644864, while the sum is 58.

The spelling of 172890428890 in words is "one hundred seventy-two billion, eight hundred ninety million, four hundred twenty-eight thousand, eight hundred ninety".