53775987 has 4 divisors (see below), whose sum is σ = 71701320. Its totient is φ = 35850656.

The previous prime is 53775983. The next prime is 53776007. The reversal of 53775987 is 78957735.

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

It is a cyclic number.

It is not a de Polignac number, because 53775987 - 2² = 53775983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53775983) 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, 8962662 + ... + 8962667.

It is an arithmetic number, because the mean of its divisors is an integer number (17925330).

Almost surely, 2^53775987 is an apocalyptic number.

53775987 is a deficient number, since it is larger than the sum of its proper divisors (17925333).

53775987 is a wasteful number, since it uses less digits than its factorization.

53775987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17925332.

The product of its digits is 1852200, while the sum is 51.

The square root of 53775987 is about 7333.2112338320. The cubic root of 53775987 is about 377.4529263116.

The spelling of 53775987 in words is "fifty-three million, seven hundred seventy-five thousand, nine hundred eighty-seven".