78561105 has 64 divisors (see below), whose sum is σ = 154275840. Its totient is φ = 33336576.

The previous prime is 78561089. The next prime is 78561151. The reversal of 78561105 is 50116587.

It is not a de Polignac number, because 78561105 - 2⁴ = 78561089 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 105364 + ... + 106106.

It is an arithmetic number, because the mean of its divisors is an integer number (2410560).

Almost surely, 2^78561105 is an apocalyptic number.

It is an amenable number.

78561105 is a deficient number, since it is larger than the sum of its proper divisors (75714735).

78561105 is a wasteful number, since it uses less digits than its factorization.

78561105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830.

The product of its (nonzero) digits is 8400, while the sum is 33.

The square root of 78561105 is about 8863.4702571848. The cubic root of 78561105 is about 428.2879554782.

The spelling of 78561105 in words is "seventy-eight million, five hundred sixty-one thousand, one hundred five".