51644074 has 4 divisors (see below), whose sum is σ = 77466114. Its totient is φ = 25822036.

The previous prime is 51644063. The next prime is 51644081. The reversal of 51644074 is 47044615.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 26574025 + 25070049 = 5155^2 + 5007^2 .

It is a super-2 number, since 2×51644074² = 5334220758634952, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12911017 + ... + 12911020.

Almost surely, 2^51644074 is an apocalyptic number.

51644074 is a deficient number, since it is larger than the sum of its proper divisors (25822040).

51644074 is a wasteful number, since it uses less digits than its factorization.

51644074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25822039.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 51644074 is about 7186.3811476987. The cubic root of 51644074 is about 372.3975641338.

Adding to 51644074 its reverse (47044615), we get a palindrome (98688689).

The spelling of 51644074 in words is "fifty-one million, six hundred forty-four thousand, seventy-four".