51427920 has 40 divisors (see below), whose sum is σ = 159427296. Its totient is φ = 13714048.

The previous prime is 51427919. The next prime is 51427921. The reversal of 51427920 is 2972415.

It is an interprime number because it is at equal distance from previous prime (51427919) and next prime (51427921).

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

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51427921) 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, 106902 + ... + 107381.

Almost surely, 2^51427920 is an apocalyptic number.

It is an amenable number.

51427920 is an abundant number, since it is smaller than the sum of its proper divisors (107999376).

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

51427920 is a wasteful number, since it uses less digits than its factorization.

51427920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214299 (or 214293 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 51427920 is about 7171.3262371754. The cubic root of 51427920 is about 371.8772863829.

The spelling of 51427920 in words is "fifty-one million, four hundred twenty-seven thousand, nine hundred twenty".