78453457 has 4 divisors (see below), whose sum is σ = 80278000. Its totient is φ = 76628916.

The previous prime is 78453443. The next prime is 78453469. The reversal of 78453457 is 75435487.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75435487 = 293 ⋅257459.

It is a cyclic number.

It is not a de Polignac number, because 78453457 - 2¹⁹ = 77929169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 1824499 = 78453457 / (7 + 8 + 4 + 5 + 3 + 4 + 5 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78453257) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 912207 + ... + 912292.

It is an arithmetic number, because the mean of its divisors is an integer number (20069500).

Almost surely, 2^78453457 is an apocalyptic number.

It is an amenable number.

78453457 is a deficient number, since it is larger than the sum of its proper divisors (1824543).

78453457 is a wasteful number, since it uses less digits than its factorization.

78453457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824542.

The product of its digits is 470400, while the sum is 43.

The square root of 78453457 is about 8857.3956104489. The cubic root of 78453457 is about 428.0922461809.

The spelling of 78453457 in words is "seventy-eight million, four hundred fifty-three thousand, four hundred fifty-seven".