78783531 has 8 divisors (see below), whose sum is σ = 105847104. Its totient is φ = 52121160.

The previous prime is 78783527. The next prime is 78783539. The reversal of 78783531 is 13538787.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78783531 - 2² = 78783527 is a prime.

It is a super-2 number, since 2×78783531² = 12413689513655922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78783539) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 99841 + ... + 100626.

It is an arithmetic number, because the mean of its divisors is an integer number (13230888).

Almost surely, 2^78783531 is an apocalyptic number.

78783531 is a deficient number, since it is larger than the sum of its proper divisors (27063573).

78783531 is a wasteful number, since it uses less digits than its factorization.

78783531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200601.

The product of its digits is 141120, while the sum is 42.

The square root of 78783531 is about 8876.0087314063. The cubic root of 78783531 is about 428.6917711412.

The spelling of 78783531 in words is "seventy-eight million, seven hundred eighty-three thousand, five hundred thirty-one".