55721426 has 16 divisors (see below), whose sum is σ = 85226688. Its totient is φ = 27315600.

The previous prime is 55721423. The next prime is 55721437. The reversal of 55721426 is 62412755.

It is a junction number, because it is equal to n+sod(n) for n = 55721392 and 55721401.

It is not an unprimeable number, because it can be changed into a prime (55721423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53531 + ... + 54561.

It is an arithmetic number, because the mean of its divisors is an integer number (5326668).

Almost surely, 2^55721426 is an apocalyptic number.

55721426 is a deficient number, since it is larger than the sum of its proper divisors (29505262).

55721426 is a wasteful number, since it uses less digits than its factorization.

55721426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537.

The product of its digits is 16800, while the sum is 32.

The square root of 55721426 is about 7464.6785597238. The cubic root of 55721426 is about 381.9507853961.

The spelling of 55721426 in words is "fifty-five million, seven hundred twenty-one thousand, four hundred twenty-six".