51720670 has 16 divisors (see below), whose sum is σ = 93195360. Its totient is φ = 20666464.

The previous prime is 51720637. The next prime is 51720673. The reversal of 51720670 is 7602715.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51720673) 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, 10116 + ... + 14344.

It is an arithmetic number, because the mean of its divisors is an integer number (5824710).

Almost surely, 2^51720670 is an apocalyptic number.

51720670 is a deficient number, since it is larger than the sum of its proper divisors (41474690).

51720670 is a wasteful number, since it uses less digits than its factorization.

51720670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5459.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 51720670 is about 7191.7084201183. The cubic root of 51720670 is about 372.5815805584.

The spelling of 51720670 in words is "fifty-one million, seven hundred twenty thousand, six hundred seventy".