51479240 has 16 divisors (see below), whose sum is σ = 115828380. Its totient is φ = 20591680.

The previous prime is 51479209. The next prime is 51479243. The reversal of 51479240 is 4297415.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 44328964 + 7150276 = 6658^2 + 2674^2 .

It is a super-2 number, since 2×51479240² = 5300224301955200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51479197 and 51479206.

It is not an unprimeable number, because it can be changed into a prime (51479243) 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, 643451 + ... + 643530.

Almost surely, 2^51479240 is an apocalyptic number.

It is an amenable number.

51479240 is an abundant number, since it is smaller than the sum of its proper divisors (64349140).

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

51479240 is a wasteful number, since it uses less digits than its factorization.

51479240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286992 (or 1286988 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 51479240 is about 7174.9034836714. The cubic root of 51479240 is about 372.0009442301. Note that the first 3 decimals are identical.

The spelling of 51479240 in words is "fifty-one million, four hundred seventy-nine thousand, two hundred forty".