90172830 has 48 divisors (see below), whose sum is σ = 237886992. Its totient is φ = 21859200.

The previous prime is 90172813. The next prime is 90172853. The reversal of 90172830 is 3827109.

It is a happy number.

It is a super-2 number, since 2×90172830² = 16262278540417800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8791 + ... + 16050.

It is an arithmetic number, because the mean of its divisors is an integer number (4955979).

Almost surely, 2^90172830 is an apocalyptic number.

90172830 is an abundant number, since it is smaller than the sum of its proper divisors (147714162).

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

90172830 is a wasteful number, since it uses less digits than its factorization.

90172830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24873 (or 24862 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 90172830 is about 9495.9375524484. The cubic root of 90172830 is about 448.4271509264.

Adding to 90172830 its reverse (3827109), we get a palindrome (93999939).

The spelling of 90172830 in words is "ninety million, one hundred seventy-two thousand, eight hundred thirty".