55808040 has 32 divisors (see below), whose sum is σ = 167424480. Its totient is φ = 14882112.

The previous prime is 55808033. The next prime is 55808047. The reversal of 55808040 is 4080855.

It is an interprime number because it is at equal distance from previous prime (55808033) and next prime (55808047).

It is a super-2 number, since 2×55808040² = 6229074657283200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55807989 and 55808007.

It is not an unprimeable number, because it can be changed into a prime (55808047) 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, 232414 + ... + 232653.

It is an arithmetic number, because the mean of its divisors is an integer number (5232015).

Almost surely, 2^55808040 is an apocalyptic number.

It is an amenable number.

55808040 is an abundant number, since it is smaller than the sum of its proper divisors (111616440).

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

55808040 is a wasteful number, since it uses less digits than its factorization.

55808040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465081 (or 465077 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 55808040 is about 7470.4778963598. The cubic root of 55808040 is about 382.1485857835.

Adding to 55808040 its reverse (4080855), we get a palindrome (59888895).

The spelling of 55808040 in words is "fifty-five million, eight hundred eight thousand, forty".