811861740 has 36 divisors (see below), whose sum is σ = 2462647824. Its totient is φ = 216496416.

The previous prime is 811861727. The next prime is 811861781. The reversal of 811861740 is 47168118.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 811861695 and 811861704.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2254992 + ... + 2255351.

It is an arithmetic number, because the mean of its divisors is an integer number (68406884).

Almost surely, 2^811861740 is an apocalyptic number.

It is an amenable number.

811861740 is an abundant number, since it is smaller than the sum of its proper divisors (1650786084).

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

811861740 is a wasteful number, since it uses less digits than its factorization.

811861740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510358 (or 4510353 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 811861740 is about 28493.1876068649. The cubic root of 811861740 is about 932.8833854451.

The spelling of 811861740 in words is "eight hundred eleven million, eight hundred sixty-one thousand, seven hundred forty".