685226190 has 32 divisors (see below), whose sum is σ = 1794047616. Its totient is φ = 166115360.

The previous prime is 685226161. The next prime is 685226197. The reversal of 685226190 is 91622586.

It is a super-2 number, since 2×685226190² = 939069862923832200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685226197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1037892 + ... + 1038551.

It is an arithmetic number, because the mean of its divisors is an integer number (56063988).

Almost surely, 2^685226190 is an apocalyptic number.

685226190 is an abundant number, since it is smaller than the sum of its proper divisors (1108821426).

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

685226190 is a wasteful number, since it uses less digits than its factorization.

685226190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076464.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 685226190 is about 26176.8254377799. The cubic root of 685226190 is about 881.6129980843.

The spelling of 685226190 in words is "six hundred eighty-five million, two hundred twenty-six thousand, one hundred ninety".