2051247678 has 16 divisors (see below), whose sum is σ = 4142326656. Its totient is φ = 677110680.

The previous prime is 2051247661. The next prime is 2051247689. The reversal of 2051247678 is 8767421502.

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 7 ways as a sum of consecutive naturals, for example, 1658968 + ... + 1660203.

It is an arithmetic number, because the mean of its divisors is an integer number (258895416).

Almost surely, 2^2051247678 is an apocalyptic number.

2051247678 is an abundant number, since it is smaller than the sum of its proper divisors (2091078978).

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

2051247678 is a wasteful number, since it uses less digits than its factorization.

2051247678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3319279.

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 2051247678 is about 45290.7018934350. The cubic root of 2051247678 is about 1270.5917588634.

The spelling of 2051247678 in words is "two billion, fifty-one million, two hundred forty-seven thousand, six hundred seventy-eight".