78448986 has 160 divisors (see below), whose sum is σ = 231390720. Its totient is φ = 19245600.

The previous prime is 78448963. The next prime is 78449009. The reversal of 78448986 is 68984487.

78448986 is a `hidden beast` number, since 7 + 84 + 489 + 86 = 666.

It is an interprime number because it is at equal distance from previous prime (78448963) and next prime (78449009).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 236841 + ... + 237171.

It is an arithmetic number, because the mean of its divisors is an integer number (1446192).

Almost surely, 2^78448986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78448986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115695360).

78448986 is an abundant number, since it is smaller than the sum of its proper divisors (152941734).

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

78448986 is a wasteful number, since it uses less digits than its factorization.

78448986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 373 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The square root of 78448986 is about 8857.1432188940. The cubic root of 78448986 is about 428.0841138144.

It can be divided in two parts, 784 and 48986, that added together give a triangular number (49770 = T₃₁₅).

The spelling of 78448986 in words is "seventy-eight million, four hundred forty-eight thousand, nine hundred eighty-six".