78463438 has 4 divisors (see below), whose sum is σ = 117695160. Its totient is φ = 39231718.

The previous prime is 78463423. The next prime is 78463481. The reversal of 78463438 is 83436487.

It is a happy number.

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

It is a super-2 number, since 2×78463438² = 12313022205559688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78463394 and 78463403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19615858 + ... + 19615861.

It is an arithmetic number, because the mean of its divisors is an integer number (29423790).

Almost surely, 2^78463438 is an apocalyptic number.

78463438 is a deficient number, since it is larger than the sum of its proper divisors (39231722).

78463438 is a wasteful number, since it uses less digits than its factorization.

78463438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39231721.

The product of its digits is 387072, while the sum is 43.

The square root of 78463438 is about 8857.9590200000. The cubic root of 78463438 is about 428.1103996513.

The spelling of 78463438 in words is "seventy-eight million, four hundred sixty-three thousand, four hundred thirty-eight".