90720403 has 4 divisors (see below), whose sum is σ = 90743488. Its totient is φ = 90697320.

The previous prime is 90720397. The next prime is 90720419. The reversal of 90720403 is 30402709.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90720403 - 2⁹ = 90719891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90720433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4008 + ... + 14053.

It is an arithmetic number, because the mean of its divisors is an integer number (22685872).

Almost surely, 2^90720403 is an apocalyptic number.

90720403 is a deficient number, since it is larger than the sum of its proper divisors (23085).

90720403 is a wasteful number, since it uses less digits than its factorization.

90720403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23084.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 90720403 is about 9524.7258753205. The cubic root of 90720403 is about 449.3330085795. Note that the first 3 decimals are identical.

The spelling of 90720403 in words is "ninety million, seven hundred twenty thousand, four hundred three".