51897806 has 8 divisors (see below), whose sum is σ = 77975544. Its totient is φ = 25905960.

The previous prime is 51897803. The next prime is 51897829. The reversal of 51897806 is 60879815.

It is a happy number.

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

It is a super-2 number, since 2×51897806² = 5386764535227272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51897803) 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, 19940 + ... + 22391.

It is an arithmetic number, because the mean of its divisors is an integer number (9746943).

Almost surely, 2^51897806 is an apocalyptic number.

51897806 is a deficient number, since it is larger than the sum of its proper divisors (26077738).

51897806 is a wasteful number, since it uses less digits than its factorization.

51897806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42946.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 51897806 is about 7204.0131871062. The cubic root of 51897806 is about 373.0064423510.

Subtracting 51897806 from its reverse (60879815), we obtain a square (8982009 = 2997²).

The spelling of 51897806 in words is "fifty-one million, eight hundred ninety-seven thousand, eight hundred six".