78155234 has 4 divisors (see below), whose sum is σ = 117232854. Its totient is φ = 39077616.

The previous prime is 78155179. The next prime is 78155237. The reversal of 78155234 is 43255187.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 75082225 + 3073009 = 8665^2 + 1753^2 .

It is a super-2 number, since 2×78155234² = 12216481203189512, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78155194 and 78155203.

It is not an unprimeable number, because it can be changed into a prime (78155237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19538807 + ... + 19538810.

Almost surely, 2^78155234 is an apocalyptic number.

78155234 is a deficient number, since it is larger than the sum of its proper divisors (39077620).

78155234 is a wasteful number, since it uses less digits than its factorization.

78155234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39077619.

The product of its digits is 33600, while the sum is 35.

The square root of 78155234 is about 8840.5448927088. The cubic root of 78155234 is about 427.5491255972.

The spelling of 78155234 in words is "seventy-eight million, one hundred fifty-five thousand, two hundred thirty-four".