55153278 has 64 divisors (see below), whose sum is σ = 129392640. Its totient is φ = 17388000.

The previous prime is 55153271. The next prime is 55153279. The reversal of 55153278 is 87235155.

55153278 is a `hidden beast` number, since 5 + 51 + 532 + 78 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55153271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78328 + ... + 79028.

It is an arithmetic number, because the mean of its divisors is an integer number (2021760).

Almost surely, 2^55153278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55153278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64696320).

55153278 is an abundant number, since it is smaller than the sum of its proper divisors (74239362).

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

55153278 is a wasteful number, since it uses less digits than its factorization.

55153278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790 (or 784 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 55153278 is about 7426.5252978765. The cubic root of 55153278 is about 380.6481965528.

The spelling of 55153278 in words is "fifty-five million, one hundred fifty-three thousand, two hundred seventy-eight".