53978811 has 4 divisors (see below), whose sum is σ = 71971752. Its totient is φ = 35985872.

The previous prime is 53978809. The next prime is 53978833. The reversal of 53978811 is 11887935.

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 53978811 - 2¹ = 53978809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53978891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8996466 + ... + 8996471.

It is an arithmetic number, because the mean of its divisors is an integer number (17992938).

Almost surely, 2^53978811 is an apocalyptic number.

53978811 is a deficient number, since it is larger than the sum of its proper divisors (17992941).

53978811 is a wasteful number, since it uses less digits than its factorization.

53978811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17992940.

The product of its digits is 60480, while the sum is 42.

The square root of 53978811 is about 7347.0273580544. The cubic root of 53978811 is about 377.9268705987.

The spelling of 53978811 in words is "fifty-three million, nine hundred seventy-eight thousand, eight hundred eleven".