90278240 has 48 divisors (see below), whose sum is σ = 229693968. Its totient is φ = 33332736.

The previous prime is 90278207. The next prime is 90278263. The reversal of 90278240 is 4287209.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 90278197 and 90278206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19622 + ... + 23781.

It is an arithmetic number, because the mean of its divisors is an integer number (4785291).

Almost surely, 2^90278240 is an apocalyptic number.

It is an amenable number.

90278240 is an abundant number, since it is smaller than the sum of its proper divisors (139415728).

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

90278240 is a wasteful number, since it uses less digits than its factorization.

90278240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43431 (or 43423 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 90278240 is about 9501.4861995374. The cubic root of 90278240 is about 448.6018166184.

The spelling of 90278240 in words is "ninety million, two hundred seventy-eight thousand, two hundred forty".