90978481 has 8 divisors (see below), whose sum is σ = 102672000. Its totient is φ = 79855440.

The previous prime is 90978469. The next prime is 90978487. The reversal of 90978481 is 18487909.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 90978481 - 2⁹ = 90977969 is a prime.

It is a super-2 number, since 2×90978481² = 16554168010134722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90978487) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 142281 + ... + 142918.

It is an arithmetic number, because the mean of its divisors is an integer number (12834000).

Almost surely, 2^90978481 is an apocalyptic number.

It is an amenable number.

90978481 is a deficient number, since it is larger than the sum of its proper divisors (11693519).

90978481 is a wasteful number, since it uses less digits than its factorization.

90978481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285239.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 90978481 is about 9538.2640454120. The cubic root of 90978481 is about 449.7586870798.

It can be divided in two parts, 9097 and 8481, that added together give a triangular number (17578 = T₁₈₇).

The spelling of 90978481 in words is "ninety million, nine hundred seventy-eight thousand, four hundred eighty-one".