51897929938 has 8 divisors (see below), whose sum is σ = 78832298880. Its totient is φ = 25620496980.

The previous prime is 51897929933. The next prime is 51897929971. The reversal of 51897929938 is 83992979815.

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

It is not an unprimeable number, because it can be changed into a prime (51897929933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164233798 + ... + 164234113.

It is an arithmetic number, because the mean of its divisors is an integer number (9854037360).

Almost surely, 2^51897929938 is an apocalyptic number.

51897929938 is a deficient number, since it is larger than the sum of its proper divisors (26934368942).

51897929938 is a wasteful number, since it uses less digits than its factorization.

51897929938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328467992.

The product of its digits is 88179840, while the sum is 70.

The spelling of 51897929938 in words is "fifty-one billion, eight hundred ninety-seven million, nine hundred twenty-nine thousand, nine hundred thirty-eight".