51642669 has 8 divisors (see below), whose sum is σ = 74153632. Its totient is φ = 31780080.

The previous prime is 51642629. The next prime is 51642671. The reversal of 51642669 is 96624615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51642669 - 2¹¹ = 51640621 is a prime.

It is a super-2 number, since 2×51642669² = 5333930522887122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 1324171 = 51642669 / (5 + 1 + 6 + 4 + 2 + 6 + 6 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51642629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 662047 + ... + 662124.

It is an arithmetic number, because the mean of its divisors is an integer number (9269204).

Almost surely, 2^51642669 is an apocalyptic number.

It is an amenable number.

51642669 is a deficient number, since it is larger than the sum of its proper divisors (22510963).

51642669 is a wasteful number, since it uses less digits than its factorization.

51642669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324187.

The product of its digits is 77760, while the sum is 39.

The square root of 51642669 is about 7186.2833926864. The cubic root of 51642669 is about 372.3941870227.

The spelling of 51642669 in words is "fifty-one million, six hundred forty-two thousand, six hundred sixty-nine".