78381270 has 160 divisors (see below), whose sum is σ = 242542080. Its totient is φ = 17962560.

The previous prime is 78381269. The next prime is 78381313. The reversal of 78381270 is 7218387.

78381270 is a `hidden beast` number, since 7 + 8 + 381 + 270 = 666.

It is a super-2 number, since 2×78381270² = 12287246973625800, which contains 22 as substring.

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 79 ways as a sum of consecutive naturals, for example, 169059 + ... + 169521.

It is an arithmetic number, because the mean of its divisors is an integer number (1515888).

Almost surely, 2^78381270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78381270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121271040).

78381270 is an abundant number, since it is smaller than the sum of its proper divisors (164160810).

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

78381270 is a wasteful number, since it uses less digits than its factorization.

78381270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 78381270 is about 8853.3197163550. The cubic root of 78381270 is about 427.9609064069.

The spelling of 78381270 in words is "seventy-eight million, three hundred eighty-one thousand, two hundred seventy".