78042787 has 2 divisors, whose sum is σ = 78042788. Its totient is φ = 78042786.

The previous prime is 78042751. The next prime is 78042793. The reversal of 78042787 is 78724087.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78042787 is a prime.

It is not a weakly prime, because it can be changed into another prime (78042707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39021393 + 39021394.

It is an arithmetic number, because the mean of its divisors is an integer number (39021394).

Almost surely, 2^78042787 is an apocalyptic number.

78042787 is a deficient number, since it is larger than the sum of its proper divisors (1).

78042787 is an equidigital number, since it uses as much as digits as its factorization.

78042787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 175616, while the sum is 43.

The square root of 78042787 is about 8834.1828710979. The cubic root of 78042787 is about 427.3439796354.

The spelling of 78042787 in words is "seventy-eight million, forty-two thousand, seven hundred eighty-seven".