210968780 has 96 divisors (see below), whose sum is σ = 521579520. Its totient is φ = 70848000.

The previous prime is 210968777. The next prime is 210968801. The reversal of 210968780 is 87869012.

It is a super-2 number, since 2×210968780² = 89015652269376800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 170765 + ... + 171995.

It is an arithmetic number, because the mean of its divisors is an integer number (5433120).

Almost surely, 2^210968780 is an apocalyptic number.

210968780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 210968780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260789760).

210968780 is an abundant number, since it is smaller than the sum of its proper divisors (310610740).

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

210968780 is a wasteful number, since it uses less digits than its factorization.

210968780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311 (or 1309 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 210968780 is about 14524.7643698616. The cubic root of 210968780 is about 595.3048175700.

The spelling of 210968780 in words is "two hundred ten million, nine hundred sixty-eight thousand, seven hundred eighty".