55388040 has 128 divisors (see below), whose sum is σ = 185328000. Its totient is φ = 13160448.

The previous prime is 55388027. The next prime is 55388077. The reversal of 55388040 is 4088355.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 55387992 and 55388010.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38046 + ... + 39474.

It is an arithmetic number, because the mean of its divisors is an integer number (1447875).

Almost surely, 2^55388040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55388040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92664000).

55388040 is an abundant number, since it is smaller than the sum of its proper divisors (129939960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55388040 is a wasteful number, since it uses less digits than its factorization.

55388040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1479 (or 1475 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 55388040 is about 7442.3141562286. The cubic root of 55388040 is about 381.1875131846.

The spelling of 55388040 in words is "fifty-five million, three hundred eighty-eight thousand, forty".