778486540 has 96 divisors (see below), whose sum is σ = 1801820160. Its totient is φ = 280800000.

The previous prime is 778486531. The next prime is 778486567. The reversal of 778486540 is 45684877.

It is a happy number.

It is a super-2 number, since 2×778486540² = 1212082585922343200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3101415 + ... + 3101665.

It is an arithmetic number, because the mean of its divisors is an integer number (18768960).

Almost surely, 2^778486540 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 778486540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (900910080).

778486540 is an abundant number, since it is smaller than the sum of its proper divisors (1023333620).

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

778486540 is a wasteful number, since it uses less digits than its factorization.

778486540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503 (or 501 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 49.

The square root of 778486540 is about 27901.3716508705. The cubic root of 778486540 is about 919.9206532072.

The spelling of 778486540 in words is "seven hundred seventy-eight million, four hundred eighty-six thousand, five hundred forty".