78987128 has 16 divisors (see below), whose sum is σ = 161564760. Its totient is φ = 35903200.

The previous prime is 78987127. The next prime is 78987137. The reversal of 78987128 is 82178987.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78987127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448703 + ... + 448878.

Almost surely, 2^78987128 is an apocalyptic number.

It is an amenable number.

78987128 is an abundant number, since it is smaller than the sum of its proper divisors (82577632).

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

78987128 is a wasteful number, since it uses less digits than its factorization.

78987128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897598 (or 897594 counting only the distinct ones).

The product of its digits is 451584, while the sum is 50.

The square root of 78987128 is about 8887.4702812443. The cubic root of 78987128 is about 429.0607369229.

The spelling of 78987128 in words is "seventy-eight million, nine hundred eighty-seven thousand, one hundred twenty-eight".