78122987 has 2 divisors, whose sum is σ = 78122988. Its totient is φ = 78122986.

The previous prime is 78122983. The next prime is 78123037. The reversal of 78122987 is 78922187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78122987 - 2² = 78122983 is a prime.

It is a super-2 number, since 2×78122987² = 12206402195604338, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78122983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39061493 + 39061494.

It is an arithmetic number, because the mean of its divisors is an integer number (39061494).

Almost surely, 2^78122987 is an apocalyptic number.

78122987 is a deficient number, since it is larger than the sum of its proper divisors (1).

78122987 is an equidigital number, since it uses as much as digits as its factorization.

78122987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 44.

The square root of 78122987 is about 8838.7208916223. The cubic root of 78122987 is about 427.4903149773.

The spelling of 78122987 in words is "seventy-eight million, one hundred twenty-two thousand, nine hundred eighty-seven".