990742428 has 120 divisors (see below), whose sum is σ = 2885762880. Its totient is φ = 294295680.

The previous prime is 990742427. The next prime is 990742429. The reversal of 990742428 is 824247099.

It is an interprime number because it is at equal distance from previous prime (990742427) and next prime (990742429).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990742427) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 118093 + ... + 126203.

It is an arithmetic number, because the mean of its divisors is an integer number (24048024).

Almost surely, 2^990742428 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 990742428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1442881440).

990742428 is an abundant number, since it is smaller than the sum of its proper divisors (1895020452).

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

990742428 is a wasteful number, since it uses less digits than its factorization.

990742428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8169 (or 8158 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 990742428 is about 31476.0611894182. The cubic root of 990742428 is about 996.9045708717.

The spelling of 990742428 in words is "nine hundred ninety million, seven hundred forty-two thousand, four hundred twenty-eight".