78287138 has 8 divisors (see below), whose sum is σ = 117527760. Its totient is φ = 39111220.

The previous prime is 78287137. The next prime is 78287161. The reversal of 78287138 is 83178287.

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

It is a super-2 number, since 2×78287138² = 12257751952462088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78287137) 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, 13028 + ... + 18063.

It is an arithmetic number, because the mean of its divisors is an integer number (14690970).

Almost surely, 2^78287138 is an apocalyptic number.

78287138 is a deficient number, since it is larger than the sum of its proper divisors (39240622).

78287138 is a wasteful number, since it uses less digits than its factorization.

78287138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32352.

The product of its digits is 150528, while the sum is 44.

The square root of 78287138 is about 8848.0019213379. The cubic root of 78287138 is about 427.7895178702.

The spelling of 78287138 in words is "seventy-eight million, two hundred eighty-seven thousand, one hundred thirty-eight".