49128557 has 4 divisors (see below), whose sum is σ = 49147356. Its totient is φ = 49109760.

The previous prime is 49128493. The next prime is 49128571. The reversal of 49128557 is 75582194.

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 48916036 + 212521 = 6994^2 + 461^2 .

It is a cyclic number.

It is not a de Polignac number, because 49128557 - 2⁶ = 49128493 is a prime.

It is a super-2 number, since 2×49128557² = 4827230225804498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49128587) 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, 4694 + ... + 10967.

It is an arithmetic number, because the mean of its divisors is an integer number (12286839).

Almost surely, 2^49128557 is an apocalyptic number.

It is an amenable number.

49128557 is a deficient number, since it is larger than the sum of its proper divisors (18799).

49128557 is a wasteful number, since it uses less digits than its factorization.

49128557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18798.

The product of its digits is 100800, while the sum is 41.

The square root of 49128557 is about 7009.1766278216. The cubic root of 49128557 is about 366.2503115157.

The spelling of 49128557 in words is "forty-nine million, one hundred twenty-eight thousand, five hundred fifty-seven".