90540540 has 36 divisors (see below), whose sum is σ = 274640184. Its totient is φ = 24144096.

The previous prime is 90540481. The next prime is 90540547. The reversal of 90540540 is 4504509.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90540547) 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, 251322 + ... + 251681.

It is an arithmetic number, because the mean of its divisors is an integer number (7628894).

Almost surely, 2^90540540 is an apocalyptic number.

90540540 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

90540540 is an abundant number, since it is smaller than the sum of its proper divisors (184099644).

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

90540540 is a wasteful number, since it uses less digits than its factorization.

90540540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503018 (or 503013 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 90540540 is about 9515.2792917497. The cubic root of 90540540 is about 449.0358617064.

The spelling of 90540540 in words is "ninety million, five hundred forty thousand, five hundred forty".