742553857 has 4 divisors (see below), whose sum is σ = 742624596. Its totient is φ = 742483120.

The previous prime is 742553843. The next prime is 742553891. The reversal of 742553857 is 758355247.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 758355247 = 13 ⋅58335019.

It can be written as a sum of positive squares in 2 ways, for example, as 231070401 + 511483456 = 15201^2 + 22616^2 .

It is a cyclic number.

It is not a de Polignac number, because 742553857 - 2¹¹ = 742551809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (742553257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16138 + ... + 41779.

It is an arithmetic number, because the mean of its divisors is an integer number (185656149).

Almost surely, 2^742553857 is an apocalyptic number.

It is an amenable number.

742553857 is a deficient number, since it is larger than the sum of its proper divisors (70739).

742553857 is a wasteful number, since it uses less digits than its factorization.

742553857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70738.

The product of its digits is 1176000, while the sum is 46.

The square root of 742553857 is about 27249.8414123826. The cubic root of 742553857 is about 905.5435038971.

The spelling of 742553857 in words is "seven hundred forty-two million, five hundred fifty-three thousand, eight hundred fifty-seven".