55578890 has 8 divisors (see below), whose sum is σ = 100042020. Its totient is φ = 22231552.

The previous prime is 55578889. The next prime is 55578893. The reversal of 55578890 is 9887555.

It can be written as a sum of positive squares in 2 ways, for example, as 45549001 + 10029889 = 6749^2 + 3167^2 .

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

It is not an unprimeable number, because it can be changed into a prime (55578893) 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, 2778935 + ... + 2778954.

Almost surely, 2^55578890 is an apocalyptic number.

55578890 is a deficient number, since it is larger than the sum of its proper divisors (44463130).

55578890 is a wasteful number, since it uses less digits than its factorization.

55578890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5557896.

The product of its (nonzero) digits is 504000, while the sum is 47.

The square root of 55578890 is about 7455.1250827870. The cubic root of 55578890 is about 381.6248292485.

The spelling of 55578890 in words is "fifty-five million, five hundred seventy-eight thousand, eight hundred ninety".