55720325 has 6 divisors (see below), whose sum is σ = 69093234. Its totient is φ = 44576240.

The previous prime is 55720309. The next prime is 55720337. The reversal of 55720325 is 52302755.

It can be written as a sum of positive squares in 3 ways, for example, as 5692996 + 50027329 = 2386^2 + 7073^2 .

It is not a de Polignac number, because 55720325 - 2⁴ = 55720309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1114382 + ... + 1114431.

It is an arithmetic number, because the mean of its divisors is an integer number (11515539).

Almost surely, 2^55720325 is an apocalyptic number.

It is an amenable number.

55720325 is a deficient number, since it is larger than the sum of its proper divisors (13372909).

55720325 is a wasteful number, since it uses less digits than its factorization.

55720325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228823 (or 2228818 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 29.

The square root of 55720325 is about 7464.6048120446. The cubic root of 55720325 is about 381.9482697235.

The spelling of 55720325 in words is "fifty-five million, seven hundred twenty thousand, three hundred twenty-five".