55721294 has 4 divisors (see below), whose sum is σ = 83581944. Its totient is φ = 27860646.

The previous prime is 55721293. The next prime is 55721329. The reversal of 55721294 is 49212755.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55721293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13930322 + ... + 13930325.

It is an arithmetic number, because the mean of its divisors is an integer number (20895486).

Almost surely, 2^55721294 is an apocalyptic number.

55721294 is a deficient number, since it is larger than the sum of its proper divisors (27860650).

55721294 is a wasteful number, since it uses less digits than its factorization.

55721294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27860649.

The product of its digits is 25200, while the sum is 35.

The square root of 55721294 is about 7464.6697180786. The cubic root of 55721294 is about 381.9504837913.

The spelling of 55721294 in words is "fifty-five million, seven hundred twenty-one thousand, two hundred ninety-four".