78636441 has 32 divisors (see below), whose sum is σ = 121080960. Its totient is φ = 44964864.

The previous prime is 78636431. The next prime is 78636443. The reversal of 78636441 is 14463687.

It is not a de Polignac number, because 78636441 - 2⁵ = 78636409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78636441.

It is not an unprimeable number, because it can be changed into a prime (78636443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54315 + ... + 55743.

It is an arithmetic number, because the mean of its divisors is an integer number (3783780).

Almost surely, 2^78636441 is an apocalyptic number.

It is an amenable number.

78636441 is a deficient number, since it is larger than the sum of its proper divisors (42444519).

78636441 is a wasteful number, since it uses less digits than its factorization.

78636441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545.

The product of its digits is 96768, while the sum is 39.

The square root of 78636441 is about 8867.7190415574. The cubic root of 78636441 is about 428.4248136740.

The spelling of 78636441 in words is "seventy-eight million, six hundred thirty-six thousand, four hundred forty-one".