42178545 has 24 divisors (see below), whose sum is σ = 74895912. Its totient is φ = 21945600.

The previous prime is 42178541. The next prime is 42178559. The reversal of 42178545 is 54587124.

42178545 is a `hidden beast` number, since 42 + 1 + 78 + 545 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3837681 + 38340864 = 1959^2 + 6192^2 .

It is not a de Polignac number, because 42178545 - 2² = 42178541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42178541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9586 + ... + 13275.

It is an arithmetic number, because the mean of its divisors is an integer number (3120663).

Almost surely, 2^42178545 is an apocalyptic number.

42178545 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42178545 is a deficient number, since it is larger than the sum of its proper divisors (32717367).

42178545 is a wasteful number, since it uses less digits than its factorization.

42178545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22913 (or 22910 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 42178545 is about 6494.5011355762. The cubic root of 42178545 is about 348.0945294132.

The spelling of 42178545 in words is "forty-two million, one hundred seventy-eight thousand, five hundred forty-five".