55619658 has 48 divisors (see below), whose sum is σ = 129182976. Its totient is φ = 17249760.

The previous prime is 55619653. The next prime is 55619693. The reversal of 55619658 is 85691655.

It is a happy number.

55619658 is a `hidden beast` number, since 556 + 1 + 96 + 5 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (55619653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13503 + ... + 17133.

It is an arithmetic number, because the mean of its divisors is an integer number (2691312).

Almost surely, 2^55619658 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55619658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64591488).

55619658 is an abundant number, since it is smaller than the sum of its proper divisors (73563318).

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

55619658 is a wasteful number, since it uses less digits than its factorization.

55619658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3699 (or 3696 counting only the distinct ones).

The product of its digits is 324000, while the sum is 45.

The square root of 55619658 is about 7457.8588079958. The cubic root of 55619658 is about 381.7181157376.

The spelling of 55619658 in words is "fifty-five million, six hundred nineteen thousand, six hundred fifty-eight".