90640390 has 8 divisors (see below), whose sum is σ = 163152720. Its totient is φ = 36256152.

The previous prime is 90640349. The next prime is 90640391. The reversal of 90640390 is 9304609.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90640391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4532010 + ... + 4532029.

It is an arithmetic number, because the mean of its divisors is an integer number (20394090).

Almost surely, 2^90640390 is an apocalyptic number.

90640390 is a deficient number, since it is larger than the sum of its proper divisors (72512330).

90640390 is a wasteful number, since it uses less digits than its factorization.

90640390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9064046.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 90640390 is about 9520.5246704160. The cubic root of 90640390 is about 449.2008697745.

Adding to 90640390 its reverse (9304609), we get a palindrome (99944999).

The spelling of 90640390 in words is "ninety million, six hundred forty thousand, three hundred ninety".