55387550 has 12 divisors (see below), whose sum is σ = 103020936. Its totient is φ = 22155000.

The previous prime is 55387531. The next prime is 55387583. The reversal of 55387550 is 5578355.

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, 553826 + ... + 553925.

It is an arithmetic number, because the mean of its divisors is an integer number (8585078).

Almost surely, 2^55387550 is an apocalyptic number.

55387550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55387550 is a deficient number, since it is larger than the sum of its proper divisors (47633386).

55387550 is a wasteful number, since it uses less digits than its factorization.

55387550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107763 (or 1107758 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 38.

The square root of 55387550 is about 7442.2812362877. The cubic root of 55387550 is about 381.1863891006.

The spelling of 55387550 in words is "fifty-five million, three hundred eighty-seven thousand, five hundred fifty".