170820490 has 16 divisors (see below), whose sum is σ = 315787752. Its totient is φ = 66481344.

The previous prime is 170820479. The next prime is 170820497. The reversal of 170820490 is 94028071.

It can be written as a sum of positive squares in 4 ways, for example, as 157226521 + 13593969 = 12539^2 + 3687^2 .

It is not an unprimeable number, because it can be changed into a prime (170820497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230469 + ... + 231208.

Almost surely, 2^170820490 is an apocalyptic number.

170820490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

170820490 is a deficient number, since it is larger than the sum of its proper divisors (144967262).

170820490 is a wasteful number, since it uses less digits than its factorization.

170820490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461721.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 170820490 is about 13069.8312919486. The cubic root of 170820490 is about 554.8556180983.

The spelling of 170820490 in words is "one hundred seventy million, eight hundred twenty thousand, four hundred ninety".