77287881 has 16 divisors (see below), whose sum is σ = 114812928. Its totient is φ = 45843600.

The previous prime is 77287879. The next prime is 77287883. The reversal of 77287881 is 18878277.

It is an interprime number because it is at equal distance from previous prime (77287879) and next prime (77287883).

It is not a de Polignac number, because 77287881 - 2¹ = 77287879 is a prime.

It is a super-2 number, since 2×77287881² = 11946833098940322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77287881.

It is not an unprimeable number, because it can be changed into a prime (77287883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23365 + ... + 26466.

It is an arithmetic number, because the mean of its divisors is an integer number (7175808).

Almost surely, 2^77287881 is an apocalyptic number.

It is an amenable number.

77287881 is a deficient number, since it is larger than the sum of its proper divisors (37525047).

77287881 is a wasteful number, since it uses less digits than its factorization.

77287881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49892.

The product of its digits is 351232, while the sum is 48.

The square root of 77287881 is about 8791.3526263027. The cubic root of 77287881 is about 425.9616168111.

The spelling of 77287881 in words is "seventy-seven million, two hundred eighty-seven thousand, eight hundred eighty-one".