53990642 has 4 divisors (see below), whose sum is σ = 80985966. Its totient is φ = 26995320.

The previous prime is 53990641. The next prime is 53990669. The reversal of 53990642 is 24609935.

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., 32821441 + 21169201 = 5729^2 + 4601^2 .

It is a junction number, because it is equal to n+sod(n) for n = 53990596 and 53990605.

It is not an unprimeable number, because it can be changed into a prime (53990641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13497659 + ... + 13497662.

Almost surely, 2^53990642 is an apocalyptic number.

53990642 is a deficient number, since it is larger than the sum of its proper divisors (26995324).

53990642 is a wasteful number, since it uses less digits than its factorization.

53990642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26995323.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 53990642 is about 7347.8324695110. The cubic root of 53990642 is about 377.9544797419.

The spelling of 53990642 in words is "fifty-three million, nine hundred ninety thousand, six hundred forty-two".