718221087 has 20 divisors (see below), whose sum is σ = 1073797560. Its totient is φ = 478412784.

The previous prime is 718221079. The next prime is 718221089. The reversal of 718221087 is 780122817.

It is a happy number.

It is not a de Polignac number, because 718221087 - 2³ = 718221079 is a prime.

It is a super-2 number, since 2×718221087² = 1031683059622923138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (718221089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 117964 + ... + 123902.

It is an arithmetic number, because the mean of its divisors is an integer number (53689878).

Almost surely, 2^718221087 is an apocalyptic number.

718221087 is a deficient number, since it is larger than the sum of its proper divisors (355576473).

718221087 is a wasteful number, since it uses less digits than its factorization.

718221087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7444 (or 7435 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 718221087 is about 26799.6471431995. The cubic root of 718221087 is about 895.5421897078.

The spelling of 718221087 in words is "seven hundred eighteen million, two hundred twenty-one thousand, eighty-seven".