90398970 has 64 divisors (see below), whose sum is σ = 251562240. Its totient is φ = 23056704.

The previous prime is 90398951. The next prime is 90398977. The reversal of 90398970 is 7989309.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (90398977) 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, 1069 + ... + 13488.

It is an arithmetic number, because the mean of its divisors is an integer number (3930660).

Almost surely, 2^90398970 is an apocalyptic number.

90398970 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 90398970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125781120).

90398970 is an abundant number, since it is smaller than the sum of its proper divisors (161163270).

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

90398970 is a wasteful number, since it uses less digits than its factorization.

90398970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14596 (or 14590 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 90398970 is about 9507.8372935174. The cubic root of 90398970 is about 448.8017007857.

The spelling of 90398970 in words is "ninety million, three hundred ninety-eight thousand, nine hundred seventy".