52157906 has 4 divisors (see below), whose sum is σ = 78236862. Its totient is φ = 26078952.

The previous prime is 52157891. The next prime is 52157909. The reversal of 52157906 is 60975125.

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

It can be written as a sum of positive squares in only one way, i.e., 31080625 + 21077281 = 5575^2 + 4591^2 .

It is not an unprimeable number, because it can be changed into a prime (52157909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13039475 + ... + 13039478.

Almost surely, 2^52157906 is an apocalyptic number.

52157906 is a deficient number, since it is larger than the sum of its proper divisors (26078956).

52157906 is a wasteful number, since it uses less digits than its factorization.

52157906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26078955.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 52157906 is about 7222.0430627351. The cubic root of 52157906 is about 373.6285453767.

The spelling of 52157906 in words is "fifty-two million, one hundred fifty-seven thousand, nine hundred six".