55381604 has 24 divisors (see below), whose sum is σ = 99499008. Its totient is φ = 26959680.

The previous prime is 55381603. The next prime is 55381609. The reversal of 55381604 is 40618355.

It is a happy number.

It is a super-2 number, since 2×55381604² = 6134244123225632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55381603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41264 + ... + 42584.

It is an arithmetic number, because the mean of its divisors is an integer number (4145792).

Almost surely, 2^55381604 is an apocalyptic number.

It is an amenable number.

55381604 is a deficient number, since it is larger than the sum of its proper divisors (44117404).

55381604 is a wasteful number, since it uses less digits than its factorization.

55381604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595 (or 1593 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 55381604 is about 7441.8817512777. The cubic root of 55381604 is about 381.1727481567.

Adding to 55381604 its reverse (40618355), we get a palindrome (95999959).

The spelling of 55381604 in words is "fifty-five million, three hundred eighty-one thousand, six hundred four".