55040634 has 80 divisors (see below), whose sum is σ = 136848096. Its totient is φ = 16394400.

The previous prime is 55040621. The next prime is 55040639. The reversal of 55040634 is 43604055.

It is a super-2 number, since 2×55040634² = 6058942782243912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 55040598 and 55040607.

It is not an unprimeable number, because it can be changed into a prime (55040639) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 119164 + ... + 119624.

Almost surely, 2^55040634 is an apocalyptic number.

55040634 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 55040634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68424048).

55040634 is an abundant number, since it is smaller than the sum of its proper divisors (81807462).

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

55040634 is a wasteful number, since it uses less digits than its factorization.

55040634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 55040634 is about 7418.9375250099. The cubic root of 55040634 is about 380.3888770643.

Adding to 55040634 its reverse (43604055), we get a palindrome (98644689).

The spelling of 55040634 in words is "fifty-five million, forty thousand, six hundred thirty-four".