90918030 has 96 divisors (see below), whose sum is σ = 256352256. Its totient is φ = 20575296.

The previous prime is 90918029. The next prime is 90918031. The reversal of 90918030 is 3081909.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90918029) and next prime (90918031).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90918031) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 186447 + ... + 186933.

It is an arithmetic number, because the mean of its divisors is an integer number (2670336).

Almost surely, 2^90918030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90918030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128176128).

90918030 is an abundant number, since it is smaller than the sum of its proper divisors (165434226).

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

90918030 is a wasteful number, since it uses less digits than its factorization.

90918030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 90918030 is about 9535.0946508150. The cubic root of 90918030 is about 449.6590503813.

Adding to 90918030 its reverse (3081909), we get a palindrome (93999939).

The spelling of 90918030 in words is "ninety million, nine hundred eighteen thousand, thirty".