51606464 has 56 divisors (see below), whose sum is σ = 126053088. Its totient is φ = 20413440.

The previous prime is 51606449. The next prime is 51606469. The reversal of 51606464 is 46460615.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 51606464.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51606469) 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, 1394 + ... + 10254.

It is an arithmetic number, because the mean of its divisors is an integer number (2250948).

Almost surely, 2^51606464 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 51606464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63026544).

51606464 is an abundant number, since it is smaller than the sum of its proper divisors (74446624).

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

51606464 is a wasteful number, since it uses less digits than its factorization.

51606464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8893 (or 8883 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 51606464 is about 7183.7639159427. The cubic root of 51606464 is about 372.3071421833.

The spelling of 51606464 in words is "fifty-one million, six hundred six thousand, four hundred sixty-four".