78143534 has 12 divisors (see below), whose sum is σ = 136352664. Its totient is φ = 33490044.

The previous prime is 78143503. The next prime is 78143551. The reversal of 78143534 is 43534187.

It is a super-2 number, since 2×78143534² = 12212823812018312, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78143494 and 78143503.

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, 398594 + ... + 398789.

It is an arithmetic number, because the mean of its divisors is an integer number (11362722).

Almost surely, 2^78143534 is an apocalyptic number.

78143534 is a deficient number, since it is larger than the sum of its proper divisors (58209130).

78143534 is a wasteful number, since it uses less digits than its factorization.

78143534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797399 (or 797392 counting only the distinct ones).

The product of its digits is 40320, while the sum is 35.

The square root of 78143534 is about 8839.8831440240. The cubic root of 78143534 is about 427.5277895367.

The spelling of 78143534 in words is "seventy-eight million, one hundred forty-three thousand, five hundred thirty-four".