78486840 has 64 divisors (see below), whose sum is σ = 261626400. Its totient is φ = 20929536.

The previous prime is 78486817. The next prime is 78486869. The reversal of 78486840 is 4868487.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35257 + ... + 37416.

Almost surely, 2^78486840 is an apocalyptic number.

It is an amenable number.

78486840 is an abundant number, since it is smaller than the sum of its proper divisors (183139560).

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

78486840 is a wasteful number, since it uses less digits than its factorization.

78486840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72693 (or 72683 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The square root of 78486840 is about 8859.2798804418. The cubic root of 78486840 is about 428.1529572380.

The spelling of 78486840 in words is "seventy-eight million, four hundred eighty-six thousand, eight hundred forty".