78987654 has 24 divisors (see below), whose sum is σ = 171313272. Its totient is φ = 26302560.

The previous prime is 78987653. The next prime is 78987673. The reversal of 78987654 is 45678987.

78987654 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 78987654.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78987653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25177 + ... + 28139.

It is an arithmetic number, because the mean of its divisors is an integer number (7138053).

Almost surely, 2^78987654 is an apocalyptic number.

78987654 is an abundant number, since it is smaller than the sum of its proper divisors (92325618).

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

78987654 is a wasteful number, since it uses less digits than its factorization.

78987654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4452 (or 4449 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The square root of 78987654 is about 8887.4998734177. The cubic root of 78987654 is about 429.0616893373.

The spelling of 78987654 in words is "seventy-eight million, nine hundred eighty-seven thousand, six hundred fifty-four".