51363640 has 32 divisors (see below), whose sum is σ = 119556000. Its totient is φ = 19836544.

The previous prime is 51363617. The next prime is 51363673. The reversal of 51363640 is 4636315.

It is a junction number, because it is equal to n+sod(n) for n = 51363599 and 51363608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20980 + ... + 23299.

It is an arithmetic number, because the mean of its divisors is an integer number (3736125).

Almost surely, 2^51363640 is an apocalyptic number.

It is an amenable number.

51363640 is an abundant number, since it is smaller than the sum of its proper divisors (68192360).

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

51363640 is a wasteful number, since it uses less digits than its factorization.

51363640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44319 (or 44315 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 51363640 is about 7166.8430986035. The cubic root of 51363640 is about 371.7222847272.

Adding to 51363640 its reverse (4636315), we get a palindrome (55999955).

It can be divided in two parts, 51363 and 640, that added together give a triangular number (52003 = T₃₂₂).

The spelling of 51363640 in words is "fifty-one million, three hundred sixty-three thousand, six hundred forty".