78135534 has 36 divisors (see below), whose sum is σ = 172035864. Its totient is φ = 25629912.

The previous prime is 78135523. The next prime is 78135569. The reversal of 78135534 is 43553187.

It is a super-2 number, since 2×78135534² = 12210323346930312, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 80319 + ... + 81285.

It is an arithmetic number, because the mean of its divisors is an integer number (4778774).

Almost surely, 2^78135534 is an apocalyptic number.

78135534 is an abundant number, since it is smaller than the sum of its proper divisors (93900330).

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

78135534 is a wasteful number, since it uses less digits than its factorization.

78135534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109 (or 1039 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 78135534 is about 8839.4306377730. The cubic root of 78135534 is about 427.5131995514.

It can be divided in two parts, 781 and 35534, that added together give a triangular number (36315 = T₂₆₉).

The spelling of 78135534 in words is "seventy-eight million, one hundred thirty-five thousand, five hundred thirty-four".