78468561 has 16 divisors (see below), whose sum is σ = 117889920. Its totient is φ = 51574320.

The previous prime is 78468529. The next prime is 78468563. The reversal of 78468561 is 16586487.

It is a happy number.

78468561 is a `hidden beast` number, since 7 + 84 + 6 + 8 + 561 = 666.

It is not a de Polignac number, because 78468561 - 2⁵ = 78468529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78468563) 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, 18550 + ... + 22383.

It is an arithmetic number, because the mean of its divisors is an integer number (7368120).

Almost surely, 2^78468561 is an apocalyptic number.

78468561 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

78468561 is a deficient number, since it is larger than the sum of its proper divisors (39421359).

78468561 is a wasteful number, since it uses less digits than its factorization.

78468561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41013 (or 41007 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 78468561 is about 8858.2481902462. The cubic root of 78468561 is about 428.1197167800.

The spelling of 78468561 in words is "seventy-eight million, four hundred sixty-eight thousand, five hundred sixty-one".