781680090 has 16 divisors (see below), whose sum is σ = 1876032288. Its totient is φ = 208448016.

The previous prime is 781680059. The next prime is 781680113. The reversal of 781680090 is 90086187.

It is a super-2 number, since 2×781680090² = 1222047526204816200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13027972 + ... + 13028031.

It is an arithmetic number, because the mean of its divisors is an integer number (117252018).

Almost surely, 2^781680090 is an apocalyptic number.

781680090 is an abundant number, since it is smaller than the sum of its proper divisors (1094352198).

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

781680090 is a wasteful number, since it uses less digits than its factorization.

781680090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26056013.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 781680090 is about 27958.5423439778. The cubic root of 781680090 is about 921.1768532669.

The spelling of 781680090 in words is "seven hundred eighty-one million, six hundred eighty thousand, ninety".