776440 has 64 divisors (see below), whose sum is σ = 2073600. Its totient is φ = 256128.

The previous prime is 776429. The next prime is 776449. The reversal of 776440 is 44677.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 776399 and 776408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (776449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13131 + ... + 13189.

It is an arithmetic number, because the mean of its divisors is an integer number (32400).

2⁷⁷⁶⁴⁴⁰ is an apocalyptic number.

776440 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 776440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1036800).

776440 is an abundant number, since it is smaller than the sum of its proper divisors (1297160).

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

776440 is a wasteful number, since it uses less digits than its factorization.

776440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 120 counting only the distinct ones).

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

The square root of 776440 is about 881.1583285653. The cubic root of 776440 is about 91.9113828477.

776440 divided by its sum of digits (28) gives a triangular number (27730 = T₂₃₅).

The spelling of 776440 in words is "seven hundred seventy-six thousand, four hundred forty".