780983840 has 96 divisors (see below), whose sum is σ = 2270903040. Its totient is φ = 247163904.

The previous prime is 780983807. The next prime is 780983843. The reversal of 780983840 is 48389087.

780983840 = T₃₁₂ + T₃₁₃ + ... + T₁₆₇₆.

It is a super-2 number, since 2×780983840² = 1219871516682291200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (780983843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12260 + ... + 41379.

It is an arithmetic number, because the mean of its divisors is an integer number (23655240).

Almost surely, 2^780983840 is an apocalyptic number.

780983840 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

780983840 is an abundant number, since it is smaller than the sum of its proper divisors (1489919200).

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

780983840 is a wasteful number, since it uses less digits than its factorization.

780983840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53674 (or 53666 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 780983840 is about 27946.0880983368. The cubic root of 780983840 is about 920.9032716525.

The spelling of 780983840 in words is "seven hundred eighty million, nine hundred eighty-three thousand, eight hundred forty".