90043978 has 16 divisors (see below), whose sum is σ = 139154400. Its totient is φ = 43673616.

The previous prime is 90043973. The next prime is 90044083. The reversal of 90043978 is 87934009.

It is a self number, because there is not a number n which added to its sum of digits gives 90043978.

It is not an unprimeable number, because it can be changed into a prime (90043973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9301 + ... + 16327.

It is an arithmetic number, because the mean of its divisors is an integer number (8697150).

Almost surely, 2^90043978 is an apocalyptic number.

90043978 is a deficient number, since it is larger than the sum of its proper divisors (49110422).

90043978 is a wasteful number, since it uses less digits than its factorization.

90043978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7221.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 90043978 is about 9489.1505415395. The cubic root of 90043978 is about 448.2134565540.

The spelling of 90043978 in words is "ninety million, forty-three thousand, nine hundred seventy-eight".