999792780 has 192 divisors, whose sum is σ = 3497582592. Its totient is φ = 208097280.

The previous prime is 999792757. The next prime is 999792791. The reversal of 999792780 is 87297999.

It is a happy number.

999792780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 219082 + ... + 223598.

It is an arithmetic number, because the mean of its divisors is an integer number (18216576).

Almost surely, 2^999792780 is an apocalyptic number.

It is a pronic number, being equal to 31619×31620.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999792780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1748791296).

999792780 is an abundant number, since it is smaller than the sum of its proper divisors (2497789812).

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

999792780 is a wasteful number, since it uses less digits than its factorization.

999792780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4584 (or 4582 counting only the distinct ones).

The product of its (nonzero) digits is 5143824, while the sum is 60.

The square root of 999792780 is about 31619.4999960467. The cubic root of 999792780 is about 999.9309218950.

The spelling of 999792780 in words is "nine hundred ninety-nine million, seven hundred ninety-two thousand, seven hundred eighty".