51642420 has 48 divisors (see below), whose sum is σ = 145006848. Its totient is φ = 13732480.

The previous prime is 51642419. The next prime is 51642421. The reversal of 51642420 is 2424615.

It is an interprime number because it is at equal distance from previous prime (51642419) and next prime (51642421).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51642421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24862 + ... + 26858.

It is an arithmetic number, because the mean of its divisors is an integer number (3020976).

Almost surely, 2^51642420 is an apocalyptic number.

It is an amenable number.

51642420 is an abundant number, since it is smaller than the sum of its proper divisors (93364428).

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

51642420 is a wasteful number, since it uses less digits than its factorization.

51642420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440 (or 2438 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 51642420 is about 7186.2660679939. The cubic root of 51642420 is about 372.3935885105.

The spelling of 51642420 in words is "fifty-one million, six hundred forty-two thousand, four hundred twenty".