51247692 has 18 divisors (see below), whose sum is σ = 129542868. Its totient is φ = 17082552.

The previous prime is 51247687. The next prime is 51247699. The reversal of 51247692 is 29674215.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1423547 = 51247692 / (5 + 1 + 2 + 4 + 7 + 6 + 9 + 2).

It is not an unprimeable number, because it can be changed into a prime (51247699) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 711738 + ... + 711809.

It is an arithmetic number, because the mean of its divisors is an integer number (7196826).

Almost surely, 2^51247692 is an apocalyptic number.

It is an amenable number.

51247692 is an abundant number, since it is smaller than the sum of its proper divisors (78295176).

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

51247692 is a wasteful number, since it uses less digits than its factorization.

51247692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423557 (or 1423552 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 51247692 is about 7158.7493321110. The cubic root of 51247692 is about 371.4423660416.

The spelling of 51247692 in words is "fifty-one million, two hundred forty-seven thousand, six hundred ninety-two".