7781906540 has 12 divisors (see below), whose sum is σ = 16342003776. Its totient is φ = 3112762608.

The previous prime is 7781906527. The next prime is 7781906543. The reversal of 7781906540 is 456091877.

It is not an unprimeable number, because it can be changed into a prime (7781906543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194547644 + ... + 194547683.

It is an arithmetic number, because the mean of its divisors is an integer number (1361833648).

Almost surely, 2^7781906540 is an apocalyptic number.

It is an amenable number.

7781906540 is an abundant number, since it is smaller than the sum of its proper divisors (8560097236).

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

7781906540 is a wasteful number, since it uses less digits than its factorization.

7781906540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389095336 (or 389095334 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 7781906540 is about 88215.1151447415. The cubic root of 7781906540 is about 1981.6578418624.

The spelling of 7781906540 in words is "seven billion, seven hundred eighty-one million, nine hundred six thousand, five hundred forty".