697872787978 has 16 divisors (see below), whose sum is σ = 1056454882560. Its totient is φ = 345721414896.

The previous prime is 697872787949. The next prime is 697872787979. The reversal of 697872787978 is 879787278796.

It is a junction number, because it is equal to n+sod(n) for n = 697872787895 and 697872787904.

It is not an unprimeable number, because it can be changed into a prime (697872787979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7498075 + ... + 7590577.

It is an arithmetic number, because the mean of its divisors is an integer number (66028430160).

Almost surely, 2^697872787978 is an apocalyptic number.

697872787978 is a deficient number, since it is larger than the sum of its proper divisors (358582094582).

697872787978 is a wasteful number, since it uses less digits than its factorization.

697872787978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127221.

The product of its digits is 8364238848, while the sum is 85.

The spelling of 697872787978 in words is "six hundred ninety-seven billion, eight hundred seventy-two million, seven hundred eighty-seven thousand, nine hundred seventy-eight".