51821828 has 12 divisors (see below), whose sum is σ = 91010640. Its totient is φ = 25818792.

The previous prime is 51821813. The next prime is 51821843. The reversal of 51821828 is 82812815.

It is an interprime number because it is at equal distance from previous prime (51821813) and next prime (51821843).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21758 + ... + 24021.

It is an arithmetic number, because the mean of its divisors is an integer number (7584220).

Almost surely, 2^51821828 is an apocalyptic number.

It is an amenable number.

51821828 is a deficient number, since it is larger than the sum of its proper divisors (39188812).

51821828 is a wasteful number, since it uses less digits than its factorization.

51821828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46066 (or 46064 counting only the distinct ones).

The product of its digits is 10240, while the sum is 35.

The square root of 51821828 is about 7198.7379449456. The cubic root of 51821828 is about 372.8243272360.

The spelling of 51821828 in words is "fifty-one million, eight hundred twenty-one thousand, eight hundred twenty-eight".