55415620 has 48 divisors (see below), whose sum is σ = 126358848. Its totient is φ = 20292480.

The previous prime is 55415617. The next prime is 55415623. The reversal of 55415620 is 2651455.

It is an interprime number because it is at equal distance from previous prime (55415617) and next prime (55415623).

It is not an unprimeable number, because it can be changed into a prime (55415623) 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, 33247 + ... + 34873.

It is an arithmetic number, because the mean of its divisors is an integer number (2632476).

Almost surely, 2^55415620 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 55415620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63179424).

55415620 is an abundant number, since it is smaller than the sum of its proper divisors (70943228).

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

55415620 is a wasteful number, since it uses less digits than its factorization.

55415620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780 (or 1778 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 55415620 is about 7444.1668439121. The cubic root of 55415620 is about 381.2507723715.

The spelling of 55415620 in words is "fifty-five million, four hundred fifteen thousand, six hundred twenty".