213762780 has 384 divisors, whose sum is σ = 853493760. Its totient is φ = 43130880.

The previous prime is 213762739. The next prime is 213762793. The reversal of 213762780 is 87267312.

213762780 is a `hidden beast` number, since 21 + 3 + 7 + 627 + 8 + 0 = 666.

It is a super-2 number, since 2×213762780² = 91389052226656800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2203692 + ... + 2203788.

It is an arithmetic number, because the mean of its divisors is an integer number (2222640).

Almost surely, 2^213762780 is an apocalyptic number.

213762780 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 213762780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (426746880).

213762780 is an abundant number, since it is smaller than the sum of its proper divisors (639730980).

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

213762780 is a wasteful number, since it uses less digits than its factorization.

213762780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 213762780 is about 14620.6285774586. The cubic root of 213762780 is about 597.9213067070.

The spelling of 213762780 in words is "two hundred thirteen million, seven hundred sixty-two thousand, seven hundred eighty".