51054640 has 80 divisors (see below), whose sum is σ = 146115648. Its totient is φ = 16155648.

The previous prime is 51054629. The next prime is 51054649. The reversal of 51054640 is 4645015.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (51054649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3774 + ... + 10786.

Almost surely, 2^51054640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51054640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73057824).

51054640 is an abundant number, since it is smaller than the sum of its proper divisors (95061008).

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

51054640 is a wasteful number, since it uses less digits than its factorization.

51054640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7046 (or 7040 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 51054640 is about 7145.2529696296. The cubic root of 51054640 is about 370.9753666535.

Adding to 51054640 its reverse (4645015), we get a palindrome (55699655).

The spelling of 51054640 in words is "fifty-one million, fifty-four thousand, six hundred forty".