30687157 has 4 divisors (see below), whose sum is σ = 30739500. Its totient is φ = 30634816.

The previous prime is 30687149. The next prime is 30687161. The reversal of 30687157 is 75178603.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20196036 + 10491121 = 4494^2 + 3239^2 .

It is a cyclic number.

It is not a de Polignac number, because 30687157 - 2³ = 30687149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30687127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25282 + ... + 26467.

It is an arithmetic number, because the mean of its divisors is an integer number (7684875).

Almost surely, 2^30687157 is an apocalyptic number.

It is an amenable number.

30687157 is a deficient number, since it is larger than the sum of its proper divisors (52343).

30687157 is an equidigital number, since it uses as much as digits as its factorization.

30687157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52342.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 30687157 is about 5539.5989927070. The cubic root of 30687157 is about 313.0777603858.

The spelling of 30687157 in words is "thirty million, six hundred eighty-seven thousand, one hundred fifty-seven".