7256378987 has 32 divisors (see below), whose sum is σ = 8777463744. Its totient is φ = 5909760000.

The previous prime is 7256378963. The next prime is 7256379017. The reversal of 7256378987 is 7898736527.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7256378987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7256378917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2416487 + ... + 2419487.

It is an arithmetic number, because the mean of its divisors is an integer number (274295742).

Almost surely, 2^7256378987 is an apocalyptic number.

7256378987 is a deficient number, since it is larger than the sum of its proper divisors (1521084757).

7256378987 is a wasteful number, since it uses less digits than its factorization.

7256378987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3519.

The product of its digits is 35562240, while the sum is 62.

The square root of 7256378987 is about 85184.3822951132. The cubic root of 7256378987 is about 1936.0057923459.

The spelling of 7256378987 in words is "seven billion, two hundred fifty-six million, three hundred seventy-eight thousand, nine hundred eighty-seven".