51064690 has 8 divisors (see below), whose sum is σ = 91916460. Its totient is φ = 20425872.

The previous prime is 51064687. The next prime is 51064703. The reversal of 51064690 is 9646015.

It can be written as a sum of positive squares in 2 ways, for example, as 42497361 + 8567329 = 6519^2 + 2927^2 .

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

It is a super-2 number, since 2×51064690² = 5215205129592200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2553225 + ... + 2553244.

Almost surely, 2^51064690 is an apocalyptic number.

51064690 is a deficient number, since it is larger than the sum of its proper divisors (40851770).

51064690 is a wasteful number, since it uses less digits than its factorization.

51064690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5106476.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 51064690 is about 7145.9561991381. The cubic root of 51064690 is about 370.9997069669. Note that the first 3 decimals are identical.

The spelling of 51064690 in words is "fifty-one million, sixty-four thousand, six hundred ninety".