87787878 has 16 divisors (see below), whose sum is σ = 176151360. Its totient is φ = 29166696.

The previous prime is 87787873. The next prime is 87787883. The reversal of 87787878 is 87878778.

It is an interprime number because it is at equal distance from previous prime (87787873) and next prime (87787883).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87787871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21988 + ... + 25671.

It is an arithmetic number, because the mean of its divisors is an integer number (11009460).

Almost surely, 2^87787878 is an apocalyptic number.

87787878 is an abundant number, since it is smaller than the sum of its proper divisors (88363482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87787878 is a wasteful number, since it uses less digits than its factorization.

87787878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47971.

The product of its digits is 9834496, while the sum is 60.

The square root of 87787878 is about 9369.5185575354. The cubic root of 87787878 is about 444.4383403375.

The spelling of 87787878 in words is "eighty-seven million, seven hundred eighty-seven thousand, eight hundred seventy-eight".