157228906 has 8 divisors (see below), whose sum is σ = 237346020. Its totient is φ = 78113568.

The previous prime is 157228879. The next prime is 157228927. The reversal of 157228906 is 609822751.

It can be written as a sum of positive squares in 2 ways, for example, as 155226681 + 2002225 = 12459^2 + 1415^2 .

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

It is a super-4 number, since 4×157228906⁴ (a number of 34 digits) contains 4444 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250051 + ... + 250678.

Almost surely, 2^157228906 is an apocalyptic number.

157228906 is a deficient number, since it is larger than the sum of its proper divisors (80117114).

157228906 is a wasteful number, since it uses less digits than its factorization.

157228906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500888.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 157228906 is about 12539.0951029171. The cubic root of 157228906 is about 539.7311258622.

The spelling of 157228906 in words is "one hundred fifty-seven million, two hundred twenty-eight thousand, nine hundred six".