90235478 has 4 divisors (see below), whose sum is σ = 135353220. Its totient is φ = 45117738.

The previous prime is 90235477. The next prime is 90235487. The reversal of 90235478 is 87453209.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90235471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22558868 + ... + 22558871.

It is an arithmetic number, because the mean of its divisors is an integer number (33838305).

Almost surely, 2^90235478 is an apocalyptic number.

90235478 is a deficient number, since it is larger than the sum of its proper divisors (45117742).

90235478 is a wasteful number, since it uses less digits than its factorization.

90235478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45117741.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 90235478 is about 9499.2356534618. The cubic root of 90235478 is about 448.5309758470.

The spelling of 90235478 in words is "ninety million, two hundred thirty-five thousand, four hundred seventy-eight".