996539778 has 144 divisors (see below), whose sum is σ = 2516282496. Its totient is φ = 283176000.

The previous prime is 996539777. The next prime is 996539801. The reversal of 996539778 is 877935699.

996539778 is a `hidden beast` number, since 9 + 96 + 539 + 7 + 7 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (996539771) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3970153 + ... + 3970403.

It is an arithmetic number, because the mean of its divisors is an integer number (17474184).

Almost surely, 2^996539778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 996539778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1258141248).

996539778 is an abundant number, since it is smaller than the sum of its proper divisors (1519742718).

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

996539778 is a wasteful number, since it uses less digits than its factorization.

996539778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 335 counting only the distinct ones).

The product of its digits is 25719120, while the sum is 63.

The square root of 996539778 is about 31568.0182779977. The cubic root of 996539778 is about 998.8452597549.

The spelling of 996539778 in words is "nine hundred ninety-six million, five hundred thirty-nine thousand, seven hundred seventy-eight".