78550641 has 20 divisors (see below), whose sum is σ = 126369012. Its totient is φ = 48338208.

The previous prime is 78550627. The next prime is 78550651. The reversal of 78550641 is 14605587.

78550641 is a `hidden beast` number, since 7 + 8 + 5 + 5 + 0 + 641 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 44957025 + 33593616 = 6705^2 + 5796^2 .

It is not a de Polignac number, because 78550641 - 2⁵ = 78550609 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78550596 and 78550605.

It is not an unprimeable number, because it can be changed into a prime (78550651) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 36246 + ... + 38351.

Almost surely, 2^78550641 is an apocalyptic number.

It is an amenable number.

78550641 is a deficient number, since it is larger than the sum of its proper divisors (47818371).

78550641 is a wasteful number, since it uses less digits than its factorization.

78550641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74622 (or 74613 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 78550641 is about 8862.8799495424. The cubic root of 78550641 is about 428.2689392650.

The spelling of 78550641 in words is "seventy-eight million, five hundred fifty thousand, six hundred forty-one".