51620439 has 32 divisors (see below), whose sum is σ = 77220864. Its totient is φ = 30464640.

The previous prime is 51620431. The next prime is 51620461. The reversal of 51620439 is 93402615.

It is not a de Polignac number, because 51620439 - 2³ = 51620431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51620431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119554 + ... + 119984.

It is an arithmetic number, because the mean of its divisors is an integer number (2413152).

Almost surely, 2^51620439 is an apocalyptic number.

51620439 is a deficient number, since it is larger than the sum of its proper divisors (25600425).

51620439 is a wasteful number, since it uses less digits than its factorization.

51620439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 51620439 is about 7184.7365296161. The cubic root of 51620439 is about 372.3407460017.

The spelling of 51620439 in words is "fifty-one million, six hundred twenty thousand, four hundred thirty-nine".