51669690 has 16 divisors (see below), whose sum is σ = 124007328. Its totient is φ = 13778576.

The previous prime is 51669689. The next prime is 51669691. The reversal of 51669690 is 9696615.

51669690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51669689) and next prime (51669691).

It is a super-2 number, since 2×51669690² = 5339513729392200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51669691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 861132 + ... + 861191.

It is an arithmetic number, because the mean of its divisors is an integer number (7750458).

Almost surely, 2^51669690 is an apocalyptic number.

51669690 is an abundant number, since it is smaller than the sum of its proper divisors (72337638).

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

51669690 is a wasteful number, since it uses less digits than its factorization.

51669690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1722333.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 51669690 is about 7188.1631867954. The cubic root of 51669690 is about 372.4591249835.

The spelling of 51669690 in words is "fifty-one million, six hundred sixty-nine thousand, six hundred ninety".