90144678 has 16 divisors (see below), whose sum is σ = 194157936. Its totient is φ = 27736800.

The previous prime is 90144667. The next prime is 90144689. The reversal of 90144678 is 87644109.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90144667) and next prime (90144689).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 577773 + ... + 577928.

It is an arithmetic number, because the mean of its divisors is an integer number (12134871).

Almost surely, 2^90144678 is an apocalyptic number.

90144678 is an abundant number, since it is smaller than the sum of its proper divisors (104013258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90144678 is a wasteful number, since it uses less digits than its factorization.

90144678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155719.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 90144678 is about 9494.4551186469. The cubic root of 90144678 is about 448.3804796799.

The spelling of 90144678 in words is "ninety million, one hundred forty-four thousand, six hundred seventy-eight".