55778078 has 8 divisors (see below), whose sum is σ = 86552280. Its totient is φ = 26927320.

The previous prime is 55778027. The next prime is 55778087. The reversal of 55778078 is 87087755.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×55778078² = 6222387970748168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 480788 + ... + 480903.

It is an arithmetic number, because the mean of its divisors is an integer number (10819035).

Almost surely, 2^55778078 is an apocalyptic number.

55778078 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

55778078 is a deficient number, since it is larger than the sum of its proper divisors (30774202).

55778078 is a wasteful number, since it uses less digits than its factorization.

55778078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961722.

The product of its (nonzero) digits is 548800, while the sum is 47.

The square root of 55778078 is about 7468.4722668026. The cubic root of 55778078 is about 382.0801847335.

The spelling of 55778078 in words is "fifty-five million, seven hundred seventy-eight thousand, seventy-eight".