51504636 has 48 divisors (see below), whose sum is σ = 126217728. Its totient is φ = 16315200.

The previous prime is 51504631. The next prime is 51504641. The reversal of 51504636 is 63640515.

It is an interprime number because it is at equal distance from previous prime (51504631) and next prime (51504641).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51504631) 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, 49441 + ... + 50471.

It is an arithmetic number, because the mean of its divisors is an integer number (2629536).

Almost surely, 2^51504636 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 51504636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63108864).

51504636 is an abundant number, since it is smaller than the sum of its proper divisors (74713092).

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

51504636 is a wasteful number, since it uses less digits than its factorization.

51504636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242 (or 1240 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 51504636 is about 7176.6730453602. The cubic root of 51504636 is about 372.0621066383.

The spelling of 51504636 in words is "fifty-one million, five hundred four thousand, six hundred thirty-six".