78144534 has 32 divisors (see below), whose sum is σ = 187014240. Its totient is φ = 24044256.

The previous prime is 78144533. The next prime is 78144541. The reversal of 78144534 is 43544187.

78144534 is a `hidden beast` number, since 7 + 81 + 44 + 534 = 666.

It is a super-2 number, since 2×78144534² = 12213136388154312, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78144533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54957 + ... + 56360.

It is an arithmetic number, because the mean of its divisors is an integer number (5844195).

Almost surely, 2^78144534 is an apocalyptic number.

78144534 is an abundant number, since it is smaller than the sum of its proper divisors (108869706).

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

78144534 is a wasteful number, since it uses less digits than its factorization.

78144534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111341 (or 111335 counting only the distinct ones).

The product of its digits is 53760, while the sum is 36.

The square root of 78144534 is about 8839.9397056767. The cubic root of 78144534 is about 427.5296132149.

The spelling of 78144534 in words is "seventy-eight million, one hundred forty-four thousand, five hundred thirty-four".