90278161 has 8 divisors (see below), whose sum is σ = 91420160. Its totient is φ = 89141472.

The previous prime is 90278099. The next prime is 90278171. The reversal of 90278161 is 16187209.

It is a happy number.

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

It is a 4-Lehmer number, since φ(90278161) divides (90278161-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 90278161 - 2¹⁷ = 90147089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90278171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41056 + ... + 43198.

It is an arithmetic number, because the mean of its divisors is an integer number (11427520).

It is a Poulet number, since it divides 2^90278160-1.

Almost surely, 2^90278161 is an apocalyptic number.

It is an amenable number.

90278161 is a deficient number, since it is larger than the sum of its proper divisors (1141999).

90278161 is a wasteful number, since it uses less digits than its factorization.

90278161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2655.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 90278161 is about 9501.4820422921. The cubic root of 90278161 is about 448.6016857654.

The spelling of 90278161 in words is "ninety million, two hundred seventy-eight thousand, one hundred sixty-one".