90378431 has 16 divisors (see below), whose sum is σ = 110799360. Its totient is φ = 72541920.

The previous prime is 90378427. The next prime is 90378433. The reversal of 90378431 is 13487309.

It is not a de Polignac number, because 90378431 - 2² = 90378427 is a prime.

It is a super-2 number, since 2×90378431² = 16336521580043522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90378391 and 90378400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90378433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10451 + ... + 17028.

It is an arithmetic number, because the mean of its divisors is an integer number (6924960).

Almost surely, 2^90378431 is an apocalyptic number.

90378431 is a deficient number, since it is larger than the sum of its proper divisors (20420929).

90378431 is a wasteful number, since it uses less digits than its factorization.

90378431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27526.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 90378431 is about 9506.7571232256. The cubic root of 90378431 is about 448.7677083765.

It can be divided in two parts, 90378 and 431, that added together give a palindrome (90809).

The spelling of 90378431 in words is "ninety million, three hundred seventy-eight thousand, four hundred thirty-one".