146778887 has 2 divisors, whose sum is σ = 146778888. Its totient is φ = 146778886.

The previous prime is 146778869. The next prime is 146778899. The reversal of 146778887 is 788877641.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 146778887 - 2⁸ = 146778631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146778587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73389443 + 73389444.

It is an arithmetic number, because the mean of its divisors is an integer number (73389444).

Almost surely, 2^146778887 is an apocalyptic number.

146778887 is a deficient number, since it is larger than the sum of its proper divisors (1).

146778887 is an equidigital number, since it uses as much as digits as its factorization.

146778887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4214784, while the sum is 56.

The square root of 146778887 is about 12115.2336750060. The cubic root of 146778887 is about 527.4984607968.

The spelling of 146778887 in words is "one hundred forty-six million, seven hundred seventy-eight thousand, eight hundred eighty-seven".