157428809 has 8 divisors (see below), whose sum is σ = 159219720. Its totient is φ = 155644416.

The previous prime is 157428793. The next prime is 157428871. The reversal of 157428809 is 908824751.

It can be written as a sum of positive squares in 4 ways, for example, as 14100025 + 143328784 = 3755^2 + 11972^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 157428809 - 2⁴ = 157428793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 157428809.

It is not an unprimeable number, because it can be changed into a prime (157428899) 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 7 ways as a sum of consecutive naturals, for example, 59417 + ... + 62009.

It is an arithmetic number, because the mean of its divisors is an integer number (19902465).

Almost surely, 2^157428809 is an apocalyptic number.

It is an amenable number.

157428809 is a deficient number, since it is larger than the sum of its proper divisors (1790911).

157428809 is a wasteful number, since it uses less digits than its factorization.

157428809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3259.

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 157428809 is about 12547.0637600994. The cubic root of 157428809 is about 539.9597695223.

The spelling of 157428809 in words is "one hundred fifty-seven million, four hundred twenty-eight thousand, eight hundred nine".