51679540 has 24 divisors (see below), whose sum is σ = 118393632. Its totient is φ = 18792480.

The previous prime is 51679517. The next prime is 51679543. The reversal of 51679540 is 4597615.

It is a super-2 number, since 2×51679540² = 5341549709223200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51679540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51679543) 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, 117234 + ... + 117673.

It is an arithmetic number, because the mean of its divisors is an integer number (4933068).

Almost surely, 2^51679540 is an apocalyptic number.

It is an amenable number.

51679540 is an abundant number, since it is smaller than the sum of its proper divisors (66714092).

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

51679540 is a wasteful number, since it uses less digits than its factorization.

51679540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234927 (or 234925 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 51679540 is about 7188.8483083175. The cubic root of 51679540 is about 372.4827912714.

The spelling of 51679540 in words is "fifty-one million, six hundred seventy-nine thousand, five hundred forty".