51485978 has 8 divisors (see below), whose sum is σ = 79720320. Its totient is φ = 24912540.

The previous prime is 51485977. The next prime is 51486053. The reversal of 51485978 is 87958415.

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 (51485971) 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, 415148 + ... + 415271.

It is an arithmetic number, because the mean of its divisors is an integer number (9965040).

Almost surely, 2^51485978 is an apocalyptic number.

51485978 is a deficient number, since it is larger than the sum of its proper divisors (28234342).

51485978 is a wasteful number, since it uses less digits than its factorization.

51485978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830452.

The product of its digits is 403200, while the sum is 47.

The square root of 51485978 is about 7175.3730216624. The cubic root of 51485978 is about 372.0171736397.

The spelling of 51485978 in words is "fifty-one million, four hundred eighty-five thousand, nine hundred seventy-eight".