90547978 has 8 divisors (see below), whose sum is σ = 135870372. Its totient is φ = 45257856.

The previous prime is 90547957. The next prime is 90547997. The reversal of 90547978 is 87974509.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 89813529 + 734449 = 9477^2 + 857^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 976 + ... + 13492.

Almost surely, 2^90547978 is an apocalyptic number.

90547978 is a deficient number, since it is larger than the sum of its proper divisors (45322394).

90547978 is a wasteful number, since it uses less digits than its factorization.

90547978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16136.

The product of its (nonzero) digits is 635040, while the sum is 49.

The square root of 90547978 is about 9515.6701287928. The cubic root of 90547978 is about 449.0481576249.

The spelling of 90547978 in words is "ninety million, five hundred forty-seven thousand, nine hundred seventy-eight".