90438778 has 8 divisors (see below), whose sum is σ = 135830772. Its totient is φ = 45161856.

The previous prime is 90438773. The next prime is 90438781. The reversal of 90438778 is 87783409.

It can be written as a sum of positive squares in 2 ways, for example, as 90307009 + 131769 = 9503^2 + 363^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×90438778² = 16358345132266568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90438773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26775 + ... + 29962.

Almost surely, 2^90438778 is an apocalyptic number.

90438778 is a deficient number, since it is larger than the sum of its proper divisors (45391994).

90438778 is a wasteful number, since it uses less digits than its factorization.

90438778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57536.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 90438778 is about 9509.9304939626. The cubic root of 90438778 is about 448.8675690741.

The spelling of 90438778 in words is "ninety million, four hundred thirty-eight thousand, seven hundred seventy-eight".