78381070 has 8 divisors (see below), whose sum is σ = 141085944. Its totient is φ = 31352424.

The previous prime is 78381047. The next prime is 78381077. The reversal of 78381070 is 7018387.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78381070² = 12287184268689800, 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 not an unprimeable number, because it can be changed into a prime (78381077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3919044 + ... + 3919063.

It is an arithmetic number, because the mean of its divisors is an integer number (17635743).

Almost surely, 2^78381070 is an apocalyptic number.

78381070 is a deficient number, since it is larger than the sum of its proper divisors (62704874).

78381070 is a wasteful number, since it uses less digits than its factorization.

78381070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7838114.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 78381070 is about 8853.3084211497. The cubic root of 78381070 is about 427.9605424073.

The spelling of 78381070 in words is "seventy-eight million, three hundred eighty-one thousand, seventy".