55778548 has 48 divisors (see below), whose sum is σ = 116121600. Its totient is φ = 22940640.

The previous prime is 55778543. The next prime is 55778549. The reversal of 55778548 is 84587755.

It is a super-2 number, since 2×55778548² = 6222492833976608, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55778543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155193 + ... + 155551.

It is an arithmetic number, because the mean of its divisors is an integer number (2419200).

Almost surely, 2^55778548 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55778548, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58060800).

55778548 is an abundant number, since it is smaller than the sum of its proper divisors (60343052).

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

55778548 is a wasteful number, since it uses less digits than its factorization.

55778548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 578 counting only the distinct ones).

The product of its digits is 1568000, while the sum is 49.

The square root of 55778548 is about 7468.5037323416. The cubic root of 55778548 is about 382.0812578982.

The spelling of 55778548 in words is "fifty-five million, seven hundred seventy-eight thousand, five hundred forty-eight".