78243534 has 12 divisors (see below), whose sum is σ = 169527696. Its totient is φ = 26081172.

The previous prime is 78243523. The next prime is 78243553. The reversal of 78243534 is 43534287.

It is a happy number.

78243534 is a `hidden beast` number, since 7 + 82 + 43 + 534 = 666.

It is a super-2 number, since 2×78243534² = 12244101225618312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2173414 + ... + 2173449.

It is an arithmetic number, because the mean of its divisors is an integer number (14127308).

Almost surely, 2^78243534 is an apocalyptic number.

78243534 is an abundant number, since it is smaller than the sum of its proper divisors (91284162).

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

78243534 is a wasteful number, since it uses less digits than its factorization.

78243534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4346871 (or 4346868 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 78243534 is about 8845.5375189979. The cubic root of 78243534 is about 427.7100803924.

The spelling of 78243534 in words is "seventy-eight million, two hundred forty-three thousand, five hundred thirty-four".