779239440 has 400 divisors, whose sum is σ = 3176046720. Its totient is φ = 173352960.

The previous prime is 779239427. The next prime is 779239451. The reversal of 779239440 is 44932977.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1859551 + ... + 1859969.

Almost surely, 2^779239440 is an apocalyptic number.

779239440 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 779239440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1588023360).

779239440 is an abundant number, since it is smaller than the sum of its proper divisors (2396807280).

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

779239440 is a wasteful number, since it uses less digits than its factorization.

779239440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492 (or 477 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The square root of 779239440 is about 27914.8605584911. The cubic root of 779239440 is about 920.2171195183.

The spelling of 779239440 in words is "seven hundred seventy-nine million, two hundred thirty-nine thousand, four hundred forty".