718220447 has 4 divisors (see below), whose sum is σ = 820823376. Its totient is φ = 615617520.

The previous prime is 718220441. The next prime is 718220473. The reversal of 718220447 is 744022817.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 744022817 = 21017 ⋅35401.

It is not a de Polignac number, because 718220447 - 2⁶ = 718220383 is a prime.

It is a super-2 number, since 2×718220447² = 1031681220977759618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (718220441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51301454 + ... + 51301467.

It is an arithmetic number, because the mean of its divisors is an integer number (205205844).

Almost surely, 2^718220447 is an apocalyptic number.

718220447 is a deficient number, since it is larger than the sum of its proper divisors (102602929).

718220447 is a wasteful number, since it uses less digits than its factorization.

718220447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102602928.

The product of its (nonzero) digits is 25088, while the sum is 35.

The square root of 718220447 is about 26799.6352027411. The cubic root of 718220447 is about 895.5419237047.

The spelling of 718220447 in words is "seven hundred eighteen million, two hundred twenty thousand, four hundred forty-seven".