211978488 has 64 divisors (see below), whose sum is σ = 560102400. Its totient is φ = 66718080.

The previous prime is 211978463. The next prime is 211978489. The reversal of 211978488 is 884879112.

It is a super-2 number, since 2×211978488² = 89869758749532288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211978489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41178 + ... + 46038.

It is an arithmetic number, because the mean of its divisors is an integer number (8751600).

Almost surely, 2^211978488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211978488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280051200).

211978488 is an abundant number, since it is smaller than the sum of its proper divisors (348123912).

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

211978488 is a wasteful number, since it uses less digits than its factorization.

211978488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4972 (or 4968 counting only the distinct ones).

The product of its digits is 258048, while the sum is 48.

The square root of 211978488 is about 14559.4810347072. The cubic root of 211978488 is about 596.2530268076.

The spelling of 211978488 in words is "two hundred eleven million, nine hundred seventy-eight thousand, four hundred eighty-eight".