781601016 has 64 divisors (see below), whose sum is σ = 2305198080. Its totient is φ = 216109440.

The previous prime is 781600979. The next prime is 781601033. The reversal of 781601016 is 610106187.

It is a happy number.

781601016 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 2×781601016² = 1221800296424464512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69831 + ... + 80246.

It is an arithmetic number, because the mean of its divisors is an integer number (36018720).

Almost surely, 2^781601016 is an apocalyptic number.

It is an amenable number.

781601016 is an abundant number, since it is smaller than the sum of its proper divisors (1523597064).

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

781601016 is a wasteful number, since it uses less digits than its factorization.

781601016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150124 (or 150120 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 781601016 is about 27957.1281786953. The cubic root of 781601016 is about 921.1457904337.

The spelling of 781601016 in words is "seven hundred eighty-one million, six hundred one thousand, sixteen".