78453646 has 4 divisors (see below), whose sum is σ = 117680472. Its totient is φ = 39226822.

The previous prime is 78453643. The next prime is 78453649. The reversal of 78453646 is 64635487.

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

It is an interprime number because it is at equal distance from previous prime (78453643) and next prime (78453649).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78453643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19613410 + ... + 19613413.

It is an arithmetic number, because the mean of its divisors is an integer number (29420118).

Almost surely, 2^78453646 is an apocalyptic number.

78453646 is a deficient number, since it is larger than the sum of its proper divisors (39226826).

78453646 is a wasteful number, since it uses less digits than its factorization.

78453646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39226825.

The product of its digits is 483840, while the sum is 43.

The square root of 78453646 is about 8857.4062794929. The cubic root of 78453646 is about 428.0925899489.

The spelling of 78453646 in words is "seventy-eight million, four hundred fifty-three thousand, six hundred forty-six".