90081378 has 24 divisors (see below), whose sum is σ = 197192268. Its totient is φ = 29716992.

The previous prime is 90081373. The next prime is 90081389. The reversal of 90081378 is 87318009.

It can be written as a sum of positive squares in 2 ways, for example, as 80514729 + 9566649 = 8973^2 + 3093^2 .

It is a super-2 number, since 2×90081378² = 16229309324757768, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90081371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24051 + ... + 27542.

Almost surely, 2^90081378 is an apocalyptic number.

90081378 is an abundant number, since it is smaller than the sum of its proper divisors (107110890).

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

90081378 is a wasteful number, since it uses less digits than its factorization.

90081378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51698 (or 51695 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 90081378 is about 9491.1210086059. The cubic root of 90081378 is about 448.2755035053.

The spelling of 90081378 in words is "ninety million, eighty-one thousand, three hundred seventy-eight".