78987636 has 288 divisors, whose sum is σ = 273960960. Its totient is φ = 19315584.

The previous prime is 78987611. The next prime is 78987641. The reversal of 78987636 is 63678987.

It is a Harshad number since it is a multiple of its sum of digits (54).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1680565 + ... + 1680611.

Almost surely, 2^78987636 is an apocalyptic number.

78987636 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78987636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136980480).

78987636 is an abundant number, since it is smaller than the sum of its proper divisors (194973324).

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

78987636 is a wasteful number, since it uses less digits than its factorization.

78987636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 91 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 78987636 is about 8887.4988607594. The cubic root of 78987636 is about 429.0616567453.

The spelling of 78987636 in words is "seventy-eight million, nine hundred eighty-seven thousand, six hundred thirty-six".