90721829 has 8 divisors (see below), whose sum is σ = 99137088. Its totient is φ = 82334560.

The previous prime is 90721801. The next prime is 90721837. The reversal of 90721829 is 92812709.

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

It is not a de Polignac number, because 90721829 - 2²⁰ = 89673253 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 90721792 and 90721801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90721229) 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, 104 + ... + 13470.

It is an arithmetic number, because the mean of its divisors is an integer number (12392136).

Almost surely, 2^90721829 is an apocalyptic number.

It is an amenable number.

90721829 is a deficient number, since it is larger than the sum of its proper divisors (8415259).

90721829 is a wasteful number, since it uses less digits than its factorization.

90721829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13995.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 90721829 is about 9524.8007328238. The cubic root of 90721829 is about 449.3353628662.

It can be divided in two parts, 9072 and 1829, that added together give a palindrome (10901).

The spelling of 90721829 in words is "ninety million, seven hundred twenty-one thousand, eight hundred twenty-nine".