78997007 has 2 divisors, whose sum is σ = 78997008. Its totient is φ = 78997006.

The previous prime is 78996997. The next prime is 78997033. The reversal of 78997007 is 70079987.

It is a weak prime.

It is an emirp because it is prime and its reverse (70079987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78997007 - 2¹² = 78992911 is a prime.

It is a super-2 number, since 2×78997007² = 12481054229916098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78997067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39498503 + 39498504.

It is an arithmetic number, because the mean of its divisors is an integer number (39498504).

Almost surely, 2^78997007 is an apocalyptic number.

78997007 is a deficient number, since it is larger than the sum of its proper divisors (1).

78997007 is an equidigital number, since it uses as much as digits as its factorization.

78997007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 222264, while the sum is 47.

The square root of 78997007 is about 8888.0260463165. The cubic root of 78997007 is about 429.0786238640.

The spelling of 78997007 in words is "seventy-eight million, nine hundred ninety-seven thousand, seven".