78661134 has 12 divisors (see below), whose sum is σ = 170432496. Its totient is φ = 26220372.

The previous prime is 78661129. The next prime is 78661139. The reversal of 78661134 is 43116687.

78661134 is a `hidden beast` number, since 7 + 8 + 6 + 611 + 34 = 666.

It is an interprime number because it is at equal distance from previous prime (78661129) and next prime (78661139).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78661139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2185014 + ... + 2185049.

It is an arithmetic number, because the mean of its divisors is an integer number (14202708).

Almost surely, 2^78661134 is an apocalyptic number.

78661134 is an abundant number, since it is smaller than the sum of its proper divisors (91771362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78661134 is a wasteful number, since it uses less digits than its factorization.

78661134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4370071 (or 4370068 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 78661134 is about 8869.1112294299. Note that the first 3 decimals coincide. The cubic root of 78661134 is about 428.4696528802.

The spelling of 78661134 in words is "seventy-eight million, six hundred sixty-one thousand, one hundred thirty-four".