55702321 has 4 divisors (see below), whose sum is σ = 55732212. Its totient is φ = 55672432.

The previous prime is 55702307. The next prime is 55702351. The reversal of 55702321 is 12320755.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31584400 + 24117921 = 5620^2 + 4911^2 .

It is a cyclic number.

It is not a de Polignac number, because 55702321 - 2⁷ = 55702193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55702351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11950 + ... + 15943.

It is an arithmetic number, because the mean of its divisors is an integer number (13933053).

Almost surely, 2^55702321 is an apocalyptic number.

It is an amenable number.

55702321 is a deficient number, since it is larger than the sum of its proper divisors (29891).

55702321 is a wasteful number, since it uses less digits than its factorization.

55702321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29890.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 55702321 is about 7463.3987565988. The cubic root of 55702321 is about 381.9071277200.

It can be divided in two parts, 55 and 702321, that multiplied together give a triangular number (38627655 = T₈₇₈₉).

The spelling of 55702321 in words is "fifty-five million, seven hundred two thousand, three hundred twenty-one".