78973406987 has 2 divisors, whose sum is σ = 78973406988. Its totient is φ = 78973406986.

The previous prime is 78973406983. The next prime is 78973407001. The reversal of 78973406987 is 78960437987.

It is a weak prime.

It is an emirp because it is prime and its reverse (78960437987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78973406987 - 2² = 78973406983 is a prime.

It is a super-2 number, since 2×78973406987² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78973406983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39486703493 + 39486703494.

It is an arithmetic number, because the mean of its divisors is an integer number (39486703494).

Almost surely, 2^78973406987 is an apocalyptic number.

78973406987 is a deficient number, since it is larger than the sum of its proper divisors (1).

78973406987 is an equidigital number, since it uses as much as digits as its factorization.

78973406987 is an evil number, because the sum of its binary digits is even.

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

The spelling of 78973406987 in words is "seventy-eight billion, nine hundred seventy-three million, four hundred six thousand, nine hundred eighty-seven".