55520078 has 4 divisors (see below), whose sum is σ = 83280120. Its totient is φ = 27760038.

The previous prime is 55520051. The next prime is 55520099. The reversal of 55520078 is 87002555.

It is a happy number.

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

It is a super-2 number, since 2×55520078² = 6164958122252168, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13880018 + ... + 13880021.

It is an arithmetic number, because the mean of its divisors is an integer number (20820030).

Almost surely, 2^55520078 is an apocalyptic number.

55520078 is a deficient number, since it is larger than the sum of its proper divisors (27760042).

55520078 is a wasteful number, since it uses less digits than its factorization.

55520078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27760041.

The product of its (nonzero) digits is 14000, while the sum is 32.

The square root of 55520078 is about 7451.1796381513. The cubic root of 55520078 is about 381.4901735624.

The spelling of 55520078 in words is "fifty-five million, five hundred twenty thousand, seventy-eight".