990655950 has 72 divisors (see below), whose sum is σ = 2544790248. Its totient is φ = 255032960.

The previous prime is 990655949. The next prime is 990655951. The reversal of 990655950 is 59556099.

It is an interprime number because it is at equal distance from previous prime (990655949) and next prime (990655951).

It is a super-2 number, since 2×990655950² = 1962798422540805000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 990655950.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990655951) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 122224 + ... + 130076.

It is an arithmetic number, because the mean of its divisors is an integer number (35344309).

Almost surely, 2^990655950 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990655950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1272395124).

990655950 is an abundant number, since it is smaller than the sum of its proper divisors (1554134298).

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

990655950 is a wasteful number, since it uses less digits than its factorization.

990655950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7926 (or 7892 counting only the distinct ones).

The product of its (nonzero) digits is 546750, while the sum is 48.

The square root of 990655950 is about 31474.6874488056. The cubic root of 990655950 is about 996.8755647380.

It can be divided in two parts, 9906 and 55950, that added together give a palindrome (65856).

The spelling of 990655950 in words is "nine hundred ninety million, six hundred fifty-five thousand, nine hundred fifty".