7978743896 has 8 divisors (see below), whose sum is σ = 14960144820. Its totient is φ = 3989371944.

The previous prime is 7978743881. The next prime is 7978743979. The reversal of 7978743896 is 6983478797.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498671486 + ... + 498671501.

Almost surely, 2^7978743896 is an apocalyptic number.

It is an amenable number.

7978743896 is a deficient number, since it is larger than the sum of its proper divisors (6981400924).

7978743896 is a wasteful number, since it uses less digits than its factorization.

7978743896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997342993 (or 997342989 counting only the distinct ones).

The product of its digits is 128024064, while the sum is 68.

The square root of 7978743896 is about 89323.8148312084. The cubic root of 7978743896 is about 1998.2270868539.

The spelling of 7978743896 in words is "seven billion, nine hundred seventy-eight million, seven hundred forty-three thousand, eight hundred ninety-six".