51690264 has 32 divisors (see below), whose sum is σ = 131667120. Its totient is φ = 16904576.

The previous prime is 51690263. The next prime is 51690281. The reversal of 51690264 is 46209615.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51690263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19047 + ... + 21590.

Almost surely, 2^51690264 is an apocalyptic number.

It is an amenable number.

51690264 is an abundant number, since it is smaller than the sum of its proper divisors (79976856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51690264 is a wasteful number, since it uses less digits than its factorization.

51690264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40699 (or 40695 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 51690264 is about 7189.5941470990. The cubic root of 51690264 is about 372.5085540729.

Adding to 51690264 its reverse (46209615), we get a palindrome (97899879).

The spelling of 51690264 in words is "fifty-one million, six hundred ninety thousand, two hundred sixty-four".