8720458 has 4 divisors (see below), whose sum is σ = 13080690. Its totient is φ = 4360228.

The previous prime is 8720447. The next prime is 8720471. The reversal of 8720458 is 8540278.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8540278 = 2 ⋅4270139.

It can be written as a sum of positive squares in only one way, i.e., 8162449 + 558009 = 2857^2 + 747^2 .

It is a d-powerful number, because it can be written as 8⁴ + 7² + 2²³ + 0 + 4⁸ + 5² + 8⁶ .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2180113 + ... + 2180116.

Almost surely, 2^8720458 is an apocalyptic number.

8720458 is a deficient number, since it is larger than the sum of its proper divisors (4360232).

8720458 is a wasteful number, since it uses less digits than its factorization.

8720458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4360231.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 8720458 is about 2953.0421602138. The cubic root of 8720458 is about 205.8320968235.

Adding to 8720458 its product of nonzero digits (17920), we get a palindrome (8738378).

The spelling of 8720458 in words is "eight million, seven hundred twenty thousand, four hundred fifty-eight".