90217530 has 64 divisors (see below), whose sum is σ = 259096320. Its totient is φ = 22206528.

The previous prime is 90217417. The next prime is 90217531. The reversal of 90217530 is 3571209.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 90217494 and 90217503.

It is not an unprimeable number, because it can be changed into a prime (90217531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9342 + ... + 16361.

It is an arithmetic number, because the mean of its divisors is an integer number (4048380).

Almost surely, 2^90217530 is an apocalyptic number.

90217530 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

90217530 is an abundant number, since it is smaller than the sum of its proper divisors (168878790).

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

90217530 is a wasteful number, since it uses less digits than its factorization.

90217530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25732 (or 25726 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 90217530 is about 9498.2908988933. The cubic root of 90217530 is about 448.5012360007.

Adding to 90217530 its reverse (3571209), we get a palindrome (93788739).

The spelling of 90217530 in words is "ninety million, two hundred seventeen thousand, five hundred thirty".