214778761 has 12 divisors (see below), whose sum is σ = 226572948. Its totient is φ = 203565824.

The previous prime is 214778749. The next prime is 214778771. The reversal of 214778761 is 167877412.

It can be written as a sum of positive squares in 2 ways, for example, as 27499536 + 187279225 = 5244^2 + 13685^2 .

It is a de Polignac number, because none of the positive numbers 2^k-214778761 is a prime.

It is a super-2 number, since 2×214778761² = 92259832353390242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (214778741) 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 11 ways as a sum of consecutive naturals, for example, 57981 + ... + 61573.

It is an arithmetic number, because the mean of its divisors is an integer number (18881079).

Almost surely, 2^214778761 is an apocalyptic number.

It is an amenable number.

214778761 is a deficient number, since it is larger than the sum of its proper divisors (11794187).

214778761 is a wasteful number, since it uses less digits than its factorization.

214778761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3752 (or 3729 counting only the distinct ones).

The product of its digits is 131712, while the sum is 43.

The square root of 214778761 is about 14655.3321695552. The cubic root of 214778761 is about 598.8670853351.

It can be divided in two parts, 2147 and 78761, that added together give a palindrome (80908).

The spelling of 214778761 in words is "two hundred fourteen million, seven hundred seventy-eight thousand, seven hundred sixty-one".