78385810 has 16 divisors (see below), whose sum is σ = 149394456. Its totient is φ = 29509888.

The previous prime is 78385799. The next prime is 78385819. The reversal of 78385810 is 1858387.

It can be written as a sum of positive squares in 4 ways, for example, as 61763881 + 16621929 = 7859^2 + 4077^2 .

It is a super-2 number, since 2×78385810² = 12288670418712200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (78385819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230377 + ... + 230716.

Almost surely, 2^78385810 is an apocalyptic number.

78385810 is a deficient number, since it is larger than the sum of its proper divisors (71008646).

78385810 is a wasteful number, since it uses less digits than its factorization.

78385810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461117.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 78385810 is about 8853.5761136391. The cubic root of 78385810 is about 427.9691690314.

The spelling of 78385810 in words is "seventy-eight million, three hundred eighty-five thousand, eight hundred ten".