78871440 has 80 divisors (see below), whose sum is σ = 252412416. Its totient is φ = 20352000.

The previous prime is 78871433. The next prime is 78871459. The reversal of 78871440 is 4417887.

It is a tau number, because it is divible by the number of its divisors (80).

It is a plaindrome in base 13.

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, 2140 + ... + 12740.

Almost surely, 2^78871440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78871440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126206208).

78871440 is an abundant number, since it is smaller than the sum of its proper divisors (173540976).

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

78871440 is a wasteful number, since it uses less digits than its factorization.

78871440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10648 (or 10642 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 39.

The square root of 78871440 is about 8880.9594076316. The cubic root of 78871440 is about 428.8511608686.

The spelling of 78871440 in words is "seventy-eight million, eight hundred seventy-one thousand, four hundred forty".