51690478 has 8 divisors (see below), whose sum is σ = 88612272. Its totient is φ = 22153056.

The previous prime is 51690473. The next prime is 51690479. The reversal of 51690478 is 87409615.

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

It is a self number, because there is not a number n which added to its sum of digits gives 51690478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51690473) 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, 1846075 + ... + 1846102.

It is an arithmetic number, because the mean of its divisors is an integer number (11076534).

Almost surely, 2^51690478 is an apocalyptic number.

51690478 is a deficient number, since it is larger than the sum of its proper divisors (36921794).

51690478 is a wasteful number, since it uses less digits than its factorization.

51690478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3692186.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 51690478 is about 7189.6090297039. The cubic root of 51690478 is about 372.5090681395.

The spelling of 51690478 in words is "fifty-one million, six hundred ninety thousand, four hundred seventy-eight".