212249778 has 32 divisors (see below), whose sum is σ = 458590272. Its totient is φ = 65102400.

The previous prime is 212249771. The next prime is 212249813. The reversal of 212249778 is 877942212.

212249778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×212249778² = 90099936522098568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212249771) 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, 21708 + ... + 29928.

It is an arithmetic number, because the mean of its divisors is an integer number (14330946).

Almost surely, 2^212249778 is an apocalyptic number.

212249778 is an abundant number, since it is smaller than the sum of its proper divisors (246340494).

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

212249778 is a wasteful number, since it uses less digits than its factorization.

212249778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8570.

The product of its digits is 112896, while the sum is 42.

The square root of 212249778 is about 14568.7946653112. The cubic root of 212249778 is about 596.5072798507.

The spelling of 212249778 in words is "two hundred twelve million, two hundred forty-nine thousand, seven hundred seventy-eight".