90278681 has 8 divisors (see below), whose sum is σ = 93578880. Its totient is φ = 87036048.

The previous prime is 90278677. The next prime is 90278689. The reversal of 90278681 is 18687209.

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 90278681 - 2² = 90278677 is a prime.

It is a super-2 number, since 2×90278681² = 16300480486199522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90278689) 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, 11186 + ... + 17483.

It is an arithmetic number, because the mean of its divisors is an integer number (11697360).

Almost surely, 2^90278681 is an apocalyptic number.

It is an amenable number.

90278681 is a deficient number, since it is larger than the sum of its proper divisors (3300199).

90278681 is a wasteful number, since it uses less digits than its factorization.

90278681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28783.

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

The square root of 90278681 is about 9501.5094064049. The cubic root of 90278681 is about 448.6025470753.

The spelling of 90278681 in words is "ninety million, two hundred seventy-eight thousand, six hundred eighty-one".