990398070 has 128 divisors (see below), whose sum is σ = 2820096000. Its totient is φ = 246468096.

The previous prime is 990398051. The next prime is 990398077. The reversal of 990398070 is 70893099.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990398077) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 582081 + ... + 583779.

It is an arithmetic number, because the mean of its divisors is an integer number (22032000).

Almost surely, 2^990398070 is an apocalyptic number.

990398070 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 990398070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1410048000).

990398070 is an abundant number, since it is smaller than the sum of its proper divisors (1829697930).

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

990398070 is a wasteful number, since it uses less digits than its factorization.

990398070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859 (or 1853 counting only the distinct ones).

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

The square root of 990398070 is about 31470.5905568993. The cubic root of 990398070 is about 996.7890575504.

The spelling of 990398070 in words is "nine hundred ninety million, three hundred ninety-eight thousand, seventy".