78315134 has 4 divisors (see below), whose sum is σ = 117472704. Its totient is φ = 39157566.

The previous prime is 78315121. The next prime is 78315137. The reversal of 78315134 is 43151387.

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

It is a super-2 number, since 2×78315134² = 12266520426875912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78315134.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78315137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19578782 + ... + 19578785.

It is an arithmetic number, because the mean of its divisors is an integer number (29368176).

Almost surely, 2^78315134 is an apocalyptic number.

78315134 is a deficient number, since it is larger than the sum of its proper divisors (39157570).

78315134 is a wasteful number, since it uses less digits than its factorization.

78315134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39157569.

The product of its digits is 10080, while the sum is 32.

The square root of 78315134 is about 8849.5838320228. The cubic root of 78315134 is about 427.8405052496.

The spelling of 78315134 in words is "seventy-eight million, three hundred fifteen thousand, one hundred thirty-four".