55678907 has 2 divisors, whose sum is σ = 55678908. Its totient is φ = 55678906.

The previous prime is 55678871. The next prime is 55678933. The reversal of 55678907 is 70987655.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55678907 - 2²⁴ = 38901691 is a prime.

It is not a weakly prime, because it can be changed into another prime (55608907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27839453 + 27839454.

It is an arithmetic number, because the mean of its divisors is an integer number (27839454).

Almost surely, 2^55678907 is an apocalyptic number.

55678907 is a deficient number, since it is larger than the sum of its proper divisors (1).

55678907 is an equidigital number, since it uses as much as digits as its factorization.

55678907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 529200, while the sum is 47.

The square root of 55678907 is about 7461.8300034241. The cubic root of 55678907 is about 381.8536097426.

The spelling of 55678907 in words is "fifty-five million, six hundred seventy-eight thousand, nine hundred seven".