90891270 has 48 divisors (see below), whose sum is σ = 240336720. Its totient is φ = 23825472.

The previous prime is 90891263. The next prime is 90891271. The reversal of 90891270 is 7219809.

It is a happy number.

It is a super-2 number, since 2×90891270² = 16522445924425800, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90891271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3249 + ... + 13868.

It is an arithmetic number, because the mean of its divisors is an integer number (5007015).

Almost surely, 2^90891270 is an apocalyptic number.

90891270 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

90891270 is an abundant number, since it is smaller than the sum of its proper divisors (149445450).

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

90891270 is a wasteful number, since it uses less digits than its factorization.

90891270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17189 (or 17186 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 90891270 is about 9533.6913102953. The cubic root of 90891270 is about 449.6149298443.

The spelling of 90891270 in words is "ninety million, eight hundred ninety-one thousand, two hundred seventy".