90113890 has 16 divisors (see below), whose sum is σ = 162787320. Its totient is φ = 35916160.

The previous prime is 90113887. The next prime is 90113893. The reversal of 90113890 is 9831109.

It is an interprime number because it is at equal distance from previous prime (90113887) and next prime (90113893).

It can be written as a sum of positive squares in 4 ways, for example, as 86731969 + 3381921 = 9313^2 + 1839^2 .

It is not an unprimeable number, because it can be changed into a prime (90113893) 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, 13225 + ... + 18844.

Almost surely, 2^90113890 is an apocalyptic number.

90113890 is a deficient number, since it is larger than the sum of its proper divisors (72673430).

90113890 is a wasteful number, since it uses less digits than its factorization.

90113890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32357.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 90113890 is about 9492.8336127839. The cubic root of 90113890 is about 448.3294272664.

Adding to 90113890 its reverse (9831109), we get a palindrome (99944999).

The spelling of 90113890 in words is "ninety million, one hundred thirteen thousand, eight hundred ninety".