77425887 has 32 divisors (see below), whose sum is σ = 129153024. Its totient is φ = 40082400.

The previous prime is 77425883. The next prime is 77425891. The reversal of 77425887 is 78852477.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77425883) and next prime (77425891).

It is not a de Polignac number, because 77425887 - 2² = 77425883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77425883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131608 + ... + 132194.

It is an arithmetic number, because the mean of its divisors is an integer number (4036032).

Almost surely, 2^77425887 is an apocalyptic number.

77425887 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

77425887 is a deficient number, since it is larger than the sum of its proper divisors (51727137).

77425887 is a wasteful number, since it uses less digits than its factorization.

77425887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179.

The product of its digits is 878080, while the sum is 48.

The square root of 77425887 is about 8799.1980884624. The cubic root of 77425887 is about 426.2149998064.

The spelling of 77425887 in words is "seventy-seven million, four hundred twenty-five thousand, eight hundred eighty-seven".