51671920 has 40 divisors (see below), whose sum is σ = 120438720. Its totient is φ = 20616960.

The previous prime is 51671911. The next prime is 51671927. The reversal of 51671920 is 2917615.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51671927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56265 + ... + 57175.

It is an arithmetic number, because the mean of its divisors is an integer number (3010968).

It is a vampire number, since it can be written as 5672 ⋅ 9110 (with its own digits).

Almost surely, 2^51671920 is an apocalyptic number.

It is an amenable number.

51671920 is an abundant number, since it is smaller than the sum of its proper divisors (68766800).

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

51671920 is a wasteful number, since it uses less digits than its factorization.

51671920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633 (or 1627 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 51671920 is about 7188.3183012440. The cubic root of 51671920 is about 372.4644831984.

The spelling of 51671920 in words is "fifty-one million, six hundred seventy-one thousand, nine hundred twenty".