51623784 has 64 divisors (see below), whose sum is σ = 144240000. Its totient is φ = 17107200.

The previous prime is 51623777. The next prime is 51623791. The reversal of 51623784 is 48732615.

It is an interprime number because it is at equal distance from previous prime (51623777) and next prime (51623791).

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 42384 + ... + 43584.

It is an arithmetic number, because the mean of its divisors is an integer number (2253750).

Almost surely, 2^51623784 is an apocalyptic number.

51623784 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51623784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72120000).

51623784 is an abundant number, since it is smaller than the sum of its proper divisors (92616216).

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

51623784 is a wasteful number, since it uses less digits than its factorization.

51623784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415 (or 1405 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 51623784 is about 7184.9693109992. The cubic root of 51623784 is about 372.3487883774.

The spelling of 51623784 in words is "fifty-one million, six hundred twenty-three thousand, seven hundred eighty-four".