55307487 has 4 divisors (see below), whose sum is σ = 73743320. Its totient is φ = 36871656.

The previous prime is 55307471. The next prime is 55307491. The reversal of 55307487 is 78470355.

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

It is not a de Polignac number, because 55307487 - 2⁴ = 55307471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55307887) 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, 9217912 + ... + 9217917.

It is an arithmetic number, because the mean of its divisors is an integer number (18435830).

Almost surely, 2^55307487 is an apocalyptic number.

55307487 is a deficient number, since it is larger than the sum of its proper divisors (18435833).

55307487 is a wasteful number, since it uses less digits than its factorization.

55307487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18435832.

The product of its (nonzero) digits is 117600, while the sum is 39.

The square root of 55307487 is about 7436.9003623822. The cubic root of 55307487 is about 381.0026315426.

The spelling of 55307487 in words is "fifty-five million, three hundred seven thousand, four hundred eighty-seven".