55211970 has 32 divisors (see below), whose sum is σ = 144555840. Its totient is φ = 13384640.

The previous prime is 55211941. The next prime is 55211977. The reversal of 55211970 is 7911255.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55211977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83325 + ... + 83984.

It is an arithmetic number, because the mean of its divisors is an integer number (4517370).

Almost surely, 2^55211970 is an apocalyptic number.

55211970 is an abundant number, since it is smaller than the sum of its proper divisors (89343870).

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

55211970 is a wasteful number, since it uses less digits than its factorization.

55211970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167330.

The product of its (nonzero) digits is 3150, while the sum is 30.

The square root of 55211970 is about 7430.4757586577. The cubic root of 55211970 is about 380.7831724154.

The spelling of 55211970 in words is "fifty-five million, two hundred eleven thousand, nine hundred seventy".