55136620 has 48 divisors (see below), whose sum is σ = 144361728. Its totient is φ = 17184960.

The previous prime is 55136597. The next prime is 55136639. The reversal of 55136620 is 2663155.

55136620 = T₂₃₉ + T₂₄₀ + ... + T₇₀₀.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16362 + ... + 19441.

It is an arithmetic number, because the mean of its divisors is an integer number (3007536).

Almost surely, 2^55136620 is an apocalyptic number.

It is an amenable number.

55136620 is an abundant number, since it is smaller than the sum of its proper divisors (89225108).

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

55136620 is a wasteful number, since it uses less digits than its factorization.

55136620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35830 (or 35828 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 55136620 is about 7425.4036927294. The cubic root of 55136620 is about 380.6098701748.

Adding to 55136620 its reverse (2663155), we get a palindrome (57799775).

The spelling of 55136620 in words is "fifty-five million, one hundred thirty-six thousand, six hundred twenty".