774640 has 40 divisors (see below), whose sum is σ = 1883808. Its totient is φ = 295680.

The previous prime is 774629. The next prime is 774643. The reversal of 774640 is 46477.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 774599 and 774608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (774643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1630 + ... + 2050.

2⁷⁷⁴⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 774640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (941904).

774640 is an abundant number, since it is smaller than the sum of its proper divisors (1109168).

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

774640 is a wasteful number, since it uses less digits than its factorization.

774640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457 (or 451 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 774640 is about 880.1363530726. The cubic root of 774640 is about 91.8403026614.

It can be divided in two parts, 7 and 74640, that added together give a palindrome (74647).

The spelling of 774640 in words is "seven hundred seventy-four thousand, six hundred forty".