51623739 has 12 divisors (see below), whose sum is σ = 74674600. Its totient is φ = 34366464.

The previous prime is 51623717. The next prime is 51623777. The reversal of 51623739 is 93732615.

It is not a de Polignac number, because 51623739 - 2⁹ = 51623227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51623639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3192 + ... + 10650.

Almost surely, 2^51623739 is an apocalyptic number.

51623739 is a deficient number, since it is larger than the sum of its proper divisors (23050861).

51623739 is a wasteful number, since it uses less digits than its factorization.

51623739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8234 (or 8231 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 51623739 is about 7184.9661794611. The cubic root of 51623739 is about 372.3486801863.

The spelling of 51623739 in words is "fifty-one million, six hundred twenty-three thousand, seven hundred thirty-nine".