51767989 has 32 divisors (see below), whose sum is σ = 68096000. Its totient is φ = 38211264.

The previous prime is 51767983. The next prime is 51767993. The reversal of 51767989 is 98976715.

It is a happy number.

It is not a de Polignac number, because 51767989 - 2¹³ = 51759797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51767983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136402 + ... + 136780.

It is an arithmetic number, because the mean of its divisors is an integer number (2128000).

Almost surely, 2^51767989 is an apocalyptic number.

It is an amenable number.

51767989 is a deficient number, since it is larger than the sum of its proper divisors (16328011).

51767989 is a wasteful number, since it uses less digits than its factorization.

51767989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497.

The product of its digits is 952560, while the sum is 52.

The square root of 51767989 is about 7194.9974982622. The cubic root of 51767989 is about 372.6951703085.

The spelling of 51767989 in words is "fifty-one million, seven hundred sixty-seven thousand, nine hundred eighty-nine".