90210729 has 16 divisors (see below), whose sum is σ = 138122240. Its totient is φ = 51302160.

The previous prime is 90210697. The next prime is 90210733. The reversal of 90210729 is 92701209.

It is not a de Polignac number, because 90210729 - 2⁵ = 90210697 is a prime.

It is a super-2 number, since 2×90210729² = 16275951253422882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90210696 and 90210705.

It is not an unprimeable number, because it can be changed into a prime (90210749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5749 + ... + 14610.

It is an arithmetic number, because the mean of its divisors is an integer number (8632640).

Almost surely, 2^90210729 is an apocalyptic number.

It is an amenable number.

90210729 is a deficient number, since it is larger than the sum of its proper divisors (47911511).

90210729 is a wasteful number, since it uses less digits than its factorization.

90210729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20580.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 90210729 is about 9497.9328803693. The cubic root of 90210729 is about 448.4899657093.

The spelling of 90210729 in words is "ninety million, two hundred ten thousand, seven hundred twenty-nine".