49128757 has 4 divisors (see below), whose sum is σ = 49750720. Its totient is φ = 48506796.

The previous prime is 49128733. The next prime is 49128763. The reversal of 49128757 is 75782194.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 49128757 - 2¹¹ = 49126709 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 (49128797) 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, 310863 + ... + 311020.

It is an arithmetic number, because the mean of its divisors is an integer number (12437680).

Almost surely, 2^49128757 is an apocalyptic number.

It is an amenable number.

49128757 is a deficient number, since it is larger than the sum of its proper divisors (621963).

49128757 is an equidigital number, since it uses as much as digits as its factorization.

49128757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621962.

The product of its digits is 141120, while the sum is 43.

The square root of 49128757 is about 7009.1908948180. The cubic root of 49128757 is about 366.2508085108.

The spelling of 49128757 in words is "forty-nine million, one hundred twenty-eight thousand, seven hundred fifty-seven".