51628775 has 24 divisors (see below), whose sum is σ = 70267824. Its totient is φ = 37318400.

The previous prime is 51628771. The next prime is 51628777. The reversal of 51628775 is 57782615.

It is not a de Polignac number, because 51628775 - 2² = 51628771 is a prime.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51628771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53699 + ... + 54651.

It is an arithmetic number, because the mean of its divisors is an integer number (2927826).

Almost surely, 2^51628775 is an apocalyptic number.

51628775 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51628775 is a deficient number, since it is larger than the sum of its proper divisors (18639049).

51628775 is a wasteful number, since it uses less digits than its factorization.

51628775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171 (or 1166 counting only the distinct ones).

The product of its digits is 117600, while the sum is 41.

The square root of 51628775 is about 7185.3166248955. The cubic root of 51628775 is about 372.3607875812.

It can be divided in two parts, 51 and 628775, that added together give a palindrome (628826).

The spelling of 51628775 in words is "fifty-one million, six hundred twenty-eight thousand, seven hundred seventy-five".