55357578 has 48 divisors (see below), whose sum is σ = 124998120. Its totient is φ = 17684352.

The previous prime is 55357553. The next prime is 55357633. The reversal of 55357578 is 87575355.

55357578 is a `hidden beast` number, since 5 + 5 + 3 + 575 + 78 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 42419169 + 12938409 = 6513^2 + 3597^2 .

It is a super-2 number, since 2×55357578² = 6128922884052168, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90000 + ... + 90612.

Almost surely, 2^55357578 is an apocalyptic number.

55357578 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 55357578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62499060).

55357578 is an abundant number, since it is smaller than the sum of its proper divisors (69640542).

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

55357578 is a wasteful number, since it uses less digits than its factorization.

55357578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823 (or 820 counting only the distinct ones).

The product of its digits is 735000, while the sum is 45.

The square root of 55357578 is about 7440.2673339068. The cubic root of 55357578 is about 381.1176192544.

The spelling of 55357578 in words is "fifty-five million, three hundred fifty-seven thousand, five hundred seventy-eight".