78463838 has 4 divisors (see below), whose sum is σ = 117695760. Its totient is φ = 39231918.

The previous prime is 78463837. The next prime is 78463841. The reversal of 78463838 is 83836487.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 78463792 and 78463801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78463837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19615958 + ... + 19615961.

It is an arithmetic number, because the mean of its divisors is an integer number (29423940).

Almost surely, 2^78463838 is an apocalyptic number.

78463838 is a deficient number, since it is larger than the sum of its proper divisors (39231922).

78463838 is a wasteful number, since it uses less digits than its factorization.

78463838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39231921.

The product of its digits is 774144, while the sum is 47.

The square root of 78463838 is about 8857.9815985359. The cubic root of 78463838 is about 428.1111271403. Note that the first 4 decimals are identical.

The spelling of 78463838 in words is "seventy-eight million, four hundred sixty-three thousand, eight hundred thirty-eight".