55520978 has 4 divisors (see below), whose sum is σ = 83281470. Its totient is φ = 27760488.

The previous prime is 55520977. The next prime is 55521001. The reversal of 55520978 is 87902555.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 51165409 + 4355569 = 7153^2 + 2087^2 .

It is not an unprimeable number, because it can be changed into a prime (55520977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13880243 + ... + 13880246.

Almost surely, 2^55520978 is an apocalyptic number.

55520978 is a deficient number, since it is larger than the sum of its proper divisors (27760492).

55520978 is a wasteful number, since it uses less digits than its factorization.

55520978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27760491.

The product of its (nonzero) digits is 126000, while the sum is 41.

The square root of 55520978 is about 7451.2400310284. The cubic root of 55520978 is about 381.4922349146.

The spelling of 55520978 in words is "fifty-five million, five hundred twenty thousand, nine hundred seventy-eight".