55173540 has 24 divisors (see below), whose sum is σ = 154486080. Its totient is φ = 14712928.

The previous prime is 55173509. The next prime is 55173541. The reversal of 55173540 is 4537155.

It is a super-2 number, since 2×55173540² = 6088239032263200, 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 = 55173498 and 55173507.

It is not an unprimeable number, because it can be changed into a prime (55173541) 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, 459720 + ... + 459839.

It is an arithmetic number, because the mean of its divisors is an integer number (6436920).

Almost surely, 2^55173540 is an apocalyptic number.

It is an amenable number.

55173540 is an abundant number, since it is smaller than the sum of its proper divisors (99312540).

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

55173540 is a wasteful number, since it uses less digits than its factorization.

55173540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919571 (or 919569 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 30.

The square root of 55173540 is about 7427.8893368170. The cubic root of 55173540 is about 380.6948045378.

It can be divided in two parts, 551735 and 40, that added together give a triangular number (551775 = T₁₀₅₀).

The spelling of 55173540 in words is "fifty-five million, one hundred seventy-three thousand, five hundred forty".