78761638 has 24 divisors (see below), whose sum is σ = 125046504. Its totient is φ = 37185120.

The previous prime is 78761633. The next prime is 78761647. The reversal of 78761638 is 83616787.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78761633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82170 + ... + 83122.

It is an arithmetic number, because the mean of its divisors is an integer number (5210271).

Almost surely, 2^78761638 is an apocalyptic number.

78761638 is a deficient number, since it is larger than the sum of its proper divisors (46284866).

78761638 is a wasteful number, since it uses less digits than its factorization.

78761638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060 (or 1029 counting only the distinct ones).

The product of its digits is 338688, while the sum is 46.

The square root of 78761638 is about 8874.7753774391. The cubic root of 78761638 is about 428.6520580256.

The spelling of 78761638 in words is "seventy-eight million, seven hundred sixty-one thousand, six hundred thirty-eight".