457978 has 4 divisors (see below), whose sum is σ = 686970. Its totient is φ = 228988.

The previous prime is 457943. The next prime is 457979. The reversal of 457978 is 879754.

457978 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 284089 + 173889 = 533^2 + 417^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 457978.

It is not an unprimeable number, because it can be changed into a prime (457979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114493 + ... + 114496.

2⁴⁵⁷⁹⁷⁸ is an apocalyptic number.

457978 is a deficient number, since it is larger than the sum of its proper divisors (228992).

457978 is a wasteful number, since it uses less digits than its factorization.

457978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228991.

The product of its digits is 70560, while the sum is 40.

The square root of 457978 is about 676.7407184439. The cubic root of 457978 is about 77.0811535460.

The spelling of 457978 in words is "four hundred fifty-seven thousand, nine hundred seventy-eight".