774400861 has 24 divisors (see below), whose sum is σ = 874354824. Its totient is φ = 681557760.

The previous prime is 774400849. The next prime is 774400871. The reversal of 774400861 is 168004477.

It can be written as a sum of positive squares in 12 ways, for example, as 14295961 + 760104900 = 3781^2 + 27570^2 .

It is not a de Polignac number, because 774400861 - 2⁷ = 774400733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 774400861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (774400871) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 942831 + ... + 943651.

It is an arithmetic number, because the mean of its divisors is an integer number (36431451).

Almost surely, 2^774400861 is an apocalyptic number.

It is an amenable number.

774400861 is a deficient number, since it is larger than the sum of its proper divisors (99953963).

774400861 is a wasteful number, since it uses less digits than its factorization.

774400861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961 (or 924 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 774400861 is about 27828.0588794835. The cubic root of 774400861 is about 918.3085101998.

The spelling of 774400861 in words is "seven hundred seventy-four million, four hundred thousand, eight hundred sixty-one".