53721994 has 4 divisors (see below), whose sum is σ = 80582994. Its totient is φ = 26860996.

The previous prime is 53721961. The next prime is 53722003. The reversal of 53721994 is 49912735.

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., 48372025 + 5349969 = 6955^2 + 2313^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13430497 + ... + 13430500.

Almost surely, 2^53721994 is an apocalyptic number.

53721994 is a deficient number, since it is larger than the sum of its proper divisors (26861000).

53721994 is a wasteful number, since it uses less digits than its factorization.

53721994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26860999.

The product of its digits is 68040, while the sum is 40.

The square root of 53721994 is about 7329.5289070990. The cubic root of 53721994 is about 377.3265586304.

The spelling of 53721994 in words is "fifty-three million, seven hundred twenty-one thousand, nine hundred ninety-four".