53189978 has 4 divisors (see below), whose sum is σ = 79784970. Its totient is φ = 26594988.

The previous prime is 53189977. The next prime is 53189993. The reversal of 53189978 is 87998135.

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., 52809289 + 380689 = 7267^2 + 617^2 .

It is not an unprimeable number, because it can be changed into a prime (53189977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13297493 + ... + 13297496.

Almost surely, 2^53189978 is an apocalyptic number.

53189978 is a deficient number, since it is larger than the sum of its proper divisors (26594992).

53189978 is a wasteful number, since it uses less digits than its factorization.

53189978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26594991.

The product of its digits is 544320, while the sum is 50.

The square root of 53189978 is about 7293.1459604206. The cubic root of 53189978 is about 376.0768525945.

It can be divided in two parts, 531 and 89978, that added together give a palindrome (90509).

The spelling of 53189978 in words is "fifty-three million, one hundred eighty-nine thousand, nine hundred seventy-eight".