90681278 has 4 divisors (see below), whose sum is σ = 136021920. Its totient is φ = 45340638.

The previous prime is 90681277. The next prime is 90681287. The reversal of 90681278 is 87218609.

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 (90681277) by changing a digit.

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 as a sum of consecutive naturals, namely, 22670318 + ... + 22670321.

It is an arithmetic number, because the mean of its divisors is an integer number (34005480).

Almost surely, 2^90681278 is an apocalyptic number.

90681278 is a deficient number, since it is larger than the sum of its proper divisors (45340642).

90681278 is a wasteful number, since it uses less digits than its factorization.

90681278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45340641.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 90681278 is about 9522.6717889466. The cubic root of 90681278 is about 449.2684046563.

The spelling of 90681278 in words is "ninety million, six hundred eighty-one thousand, two hundred seventy-eight".