780726816 has 192 divisors, whose sum is σ = 2381783040. Its totient is φ = 248520960.

The previous prime is 780726799. The next prime is 780726827. The reversal of 780726816 is 618627087.

It is a super-2 number, since 2×780726816² = 1219068722442995712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2758611 + ... + 2758893.

It is an arithmetic number, because the mean of its divisors is an integer number (12405120).

Almost surely, 2^780726816 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 780726816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1190891520).

780726816 is an abundant number, since it is smaller than the sum of its proper divisors (1601056224).

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

780726816 is a wasteful number, since it uses less digits than its factorization.

780726816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 780726816 is about 27941.4891514393. The cubic root of 780726816 is about 920.8022366072.

The spelling of 780726816 in words is "seven hundred eighty million, seven hundred twenty-six thousand, eight hundred sixteen".