51697808 has 10 divisors (see below), whose sum is σ = 100164534. Its totient is φ = 25848896.

The previous prime is 51697787. The next prime is 51697823. The reversal of 51697808 is 80879615.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 47169424 + 4528384 = 6868^2 + 2128^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1615541 + ... + 1615572.

Almost surely, 2^51697808 is an apocalyptic number.

It is an amenable number.

51697808 is a deficient number, since it is larger than the sum of its proper divisors (48466726).

51697808 is a wasteful number, since it uses less digits than its factorization.

51697808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3231121 (or 3231115 counting only the distinct ones).

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

The square root of 51697808 is about 7190.1187750968. The cubic root of 51697808 is about 372.5266752664.

The spelling of 51697808 in words is "fifty-one million, six hundred ninety-seven thousand, eight hundred eight".