51618520 has 16 divisors (see below), whose sum is σ = 116141760. Its totient is φ = 20647392.

The previous prime is 51618499. The next prime is 51618527. The reversal of 51618520 is 2581615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51618527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645192 + ... + 645271.

It is an arithmetic number, because the mean of its divisors is an integer number (7258860).

Almost surely, 2^51618520 is an apocalyptic number.

It is an amenable number.

51618520 is an abundant number, since it is smaller than the sum of its proper divisors (64523240).

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

51618520 is a wasteful number, since it uses less digits than its factorization.

51618520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290474 (or 1290470 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 51618520 is about 7184.6029813762. The cubic root of 51618520 is about 372.3361319976.

The spelling of 51618520 in words is "fifty-one million, six hundred eighteen thousand, five hundred twenty".