55770890 has 48 divisors (see below), whose sum is σ = 121139712. Its totient is φ = 18106848.

The previous prime is 55770853. The next prime is 55770899. The reversal of 55770890 is 9807755.

It is a happy number.

It is a super-2 number, since 2×55770890² = 6220784342784200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55770899) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24167 + ... + 26373.

It is an arithmetic number, because the mean of its divisors is an integer number (2523744).

Almost surely, 2^55770890 is an apocalyptic number.

55770890 is an abundant number, since it is smaller than the sum of its proper divisors (65368822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55770890 is a wasteful number, since it uses less digits than its factorization.

55770890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2259 (or 2240 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 41.

The square root of 55770890 is about 7467.9910283824. The cubic root of 55770890 is about 382.0637714134.

The spelling of 55770890 in words is "fifty-five million, seven hundred seventy thousand, eight hundred ninety".