55878857 has 4 divisors (see below), whose sum is σ = 56318976. Its totient is φ = 55438740.

The previous prime is 55878811. The next prime is 55878869. The reversal of 55878857 is 75887855.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75887855 = 5 ⋅15177571.

It is a cyclic number.

It is not a de Polignac number, because 55878857 - 2¹² = 55874761 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55878799 and 55878808.

It is not an unprimeable number, because it can be changed into a prime (55838857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219869 + ... + 220122.

It is an arithmetic number, because the mean of its divisors is an integer number (14079744).

Almost surely, 2^55878857 is an apocalyptic number.

It is an amenable number.

55878857 is a deficient number, since it is larger than the sum of its proper divisors (440119).

55878857 is a wasteful number, since it uses less digits than its factorization.

55878857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440118.

The product of its digits is 3136000, while the sum is 53.

The square root of 55878857 is about 7475.2161841648. The cubic root of 55878857 is about 382.3101585457.

The spelling of 55878857 in words is "fifty-five million, eight hundred seventy-eight thousand, eight hundred fifty-seven".