51440064 has 112 divisors (see below), whose sum is σ = 150802848. Its totient is φ = 15372288.

The previous prime is 51440047. The next prime is 51440071. The reversal of 51440064 is 46004415.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92074 + ... + 92630.

It is an arithmetic number, because the mean of its divisors is an integer number (1346454).

Almost surely, 2^51440064 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 51440064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75401424).

51440064 is an abundant number, since it is smaller than the sum of its proper divisors (99362784).

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

51440064 is a wasteful number, since it uses less digits than its factorization.

51440064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622 (or 612 counting only the distinct ones).

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

The square root of 51440064 is about 7172.1728925061. The cubic root of 51440064 is about 371.9065553243.

Adding to 51440064 its reverse (46004415), we get a palindrome (97444479).

The spelling of 51440064 in words is "fifty-one million, four hundred forty thousand, sixty-four".