1685272656 has 40 divisors (see below), whose sum is σ = 4356801504. Its totient is φ = 561347200.

The previous prime is 1685272609. The next prime is 1685272657. The reversal of 1685272656 is 6562725861.

It is a happy number.

It is a super-2 number, since 2×1685272656² = 5680287850122588672, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685272657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57550 + ... + 81746.

Almost surely, 2^1685272656 is an apocalyptic number.

1685272656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1685272656 is an abundant number, since it is smaller than the sum of its proper divisors (2671528848).

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

1685272656 is a wasteful number, since it uses less digits than its factorization.

1685272656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25659 (or 25653 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 48.

The square root of 1685272656 is about 41052.0724933590. The cubic root of 1685272656 is about 1190.0267526881.

The spelling of 1685272656 in words is "one billion, six hundred eighty-five million, two hundred seventy-two thousand, six hundred fifty-six".