778426740 has 576 divisors, whose sum is σ = 3174635520. Its totient is φ = 156764160.

The previous prime is 778426699. The next prime is 778426763. The reversal of 778426740 is 47624877.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 10663344 + ... + 10663416.

It is an arithmetic number, because the mean of its divisors is an integer number (5511520).

Almost surely, 2^778426740 is an apocalyptic number.

778426740 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 778426740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1587317760).

778426740 is an abundant number, since it is smaller than the sum of its proper divisors (2396208780).

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

778426740 is a wasteful number, since it uses less digits than its factorization.

778426740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 45.

The square root of 778426740 is about 27900.2999983871. The cubic root of 778426740 is about 919.8970978166.

The spelling of 778426740 in words is "seven hundred seventy-eight million, four hundred twenty-six thousand, seven hundred forty".