42724557 has 8 divisors (see below), whose sum is σ = 63295680. Its totient is φ = 28483020.

The previous prime is 42724531. The next prime is 42724579. The reversal of 42724557 is 75542724.

It is a happy number.

It is not a de Polignac number, because 42724557 - 2¹⁶ = 42659021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42724657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 791169 + ... + 791222.

It is an arithmetic number, because the mean of its divisors is an integer number (7911960).

Almost surely, 2^42724557 is an apocalyptic number.

It is an amenable number.

42724557 is a deficient number, since it is larger than the sum of its proper divisors (20571123).

42724557 is a wasteful number, since it uses less digits than its factorization.

42724557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1582400 (or 1582394 counting only the distinct ones).

The product of its digits is 78400, while the sum is 36.

The square root of 42724557 is about 6536.4024508899. The cubic root of 42724557 is about 349.5901515491.

The spelling of 42724557 in words is "forty-two million, seven hundred twenty-four thousand, five hundred fifty-seven".