781991496 has 384 divisors, whose sum is σ = 2696803200. Its totient is φ = 209018880.

The previous prime is 781991491. The next prime is 781991557. The reversal of 781991496 is 694199187.

781991496 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×781991496² = 1223021399632636032, which contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (781991491) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8061720 + ... + 8061816.

It is an arithmetic number, because the mean of its divisors is an integer number (7022925).

Almost surely, 2^781991496 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 781991496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1348401600).

781991496 is an abundant number, since it is smaller than the sum of its proper divisors (1914811704).

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

781991496 is a wasteful number, since it uses less digits than its factorization.

781991496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 155 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 781991496 is about 27964.1108565962. The cubic root of 781991496 is about 921.2991632835.

The spelling of 781991496 in words is "seven hundred eighty-one million, nine hundred ninety-one thousand, four hundred ninety-six".