55987207 has 2 divisors, whose sum is σ = 55987208. Its totient is φ = 55987206.

The previous prime is 55987201. The next prime is 55987237. The reversal of 55987207 is 70278955.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55987207 - 2⁷ = 55987079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55987201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27993603 + 27993604.

It is an arithmetic number, because the mean of its divisors is an integer number (27993604).

Almost surely, 2^55987207 is an apocalyptic number.

55987207 is a deficient number, since it is larger than the sum of its proper divisors (1).

55987207 is an equidigital number, since it uses as much as digits as its factorization.

55987207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 176400, while the sum is 43.

The square root of 55987207 is about 7482.4599564582. The cubic root of 55987207 is about 382.5571008493.

The spelling of 55987207 in words is "fifty-five million, nine hundred eighty-seven thousand, two hundred seven".