78215134 has 16 divisors (see below), whose sum is σ = 128868480. Its totient is φ = 35438040.

The previous prime is 78215119. The next prime is 78215141. The reversal of 78215134 is 43151287.

It is a super-2 number, since 2×78215134² = 12235214373275912, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78215096 and 78215105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43872 + ... + 45619.

It is an arithmetic number, because the mean of its divisors is an integer number (8054280).

Almost surely, 2^78215134 is an apocalyptic number.

78215134 is a deficient number, since it is larger than the sum of its proper divisors (50653346).

78215134 is a wasteful number, since it uses less digits than its factorization.

78215134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89535.

The product of its digits is 6720, while the sum is 31.

The square root of 78215134 is about 8843.9320440628. The cubic root of 78215134 is about 427.6583255887.

The spelling of 78215134 in words is "seventy-eight million, two hundred fifteen thousand, one hundred thirty-four".