55620078 has 16 divisors (see below), whose sum is σ = 111358800. Its totient is φ = 18520256.

The previous prime is 55620053. The next prime is 55620079. The reversal of 55620078 is 87002655.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55620079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1876 + ... + 10712.

It is an arithmetic number, because the mean of its divisors is an integer number (6959925).

Almost surely, 2^55620078 is an apocalyptic number.

55620078 is an abundant number, since it is smaller than the sum of its proper divisors (55738722).

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

55620078 is a wasteful number, since it uses less digits than its factorization.

55620078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9891.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 55620078 is about 7457.8869661587. The cubic root of 55620078 is about 381.7190765562.

The spelling of 55620078 in words is "fifty-five million, six hundred twenty thousand, seventy-eight".