90442380 has 192 divisors, whose sum is σ = 313528320. Its totient is φ = 19009536.

The previous prime is 90442367. The next prime is 90442409. The reversal of 90442380 is 8324409.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 378301 + ... + 378539.

It is an arithmetic number, because the mean of its divisors is an integer number (1632960).

Almost surely, 2^90442380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90442380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156764160).

90442380 is an abundant number, since it is smaller than the sum of its proper divisors (223085940).

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

90442380 is a wasteful number, since it uses less digits than its factorization.

90442380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 90442380 is about 9510.1198730615. The cubic root of 90442380 is about 448.8735281680.

Adding to 90442380 its reverse (8324409), we get a palindrome (98766789).

The spelling of 90442380 in words is "ninety million, four hundred forty-two thousand, three hundred eighty".