42780457 has 4 divisors (see below), whose sum is σ = 45032080. Its totient is φ = 40528836.

The previous prime is 42780443. The next prime is 42780497. The reversal of 42780457 is 75408724.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42780457 is a prime.

It is a super-2 number, since 2×42780457² = 3660335002257698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42780407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1125783 + ... + 1125820.

It is an arithmetic number, because the mean of its divisors is an integer number (11258020).

Almost surely, 2^42780457 is an apocalyptic number.

It is an amenable number.

42780457 is a deficient number, since it is larger than the sum of its proper divisors (2251623).

42780457 is a wasteful number, since it uses less digits than its factorization.

42780457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251622.

The product of its (nonzero) digits is 62720, while the sum is 37.

The square root of 42780457 is about 6540.6771056214. The cubic root of 42780457 is about 349.7425508108.

The spelling of 42780457 in words is "forty-two million, seven hundred eighty thousand, four hundred fifty-seven".