51620737 has 4 divisors (see below), whose sum is σ = 58995136. Its totient is φ = 44246340.

The previous prime is 51620729. The next prime is 51620741. The reversal of 51620737 is 73702615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51620737 - 2³ = 51620729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51620699 and 51620708.

It is not an unprimeable number, because it can be changed into a prime (51620137) 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, 3687189 + ... + 3687202.

It is an arithmetic number, because the mean of its divisors is an integer number (14748784).

Almost surely, 2^51620737 is an apocalyptic number.

It is an amenable number.

51620737 is a deficient number, since it is larger than the sum of its proper divisors (7374399).

51620737 is an equidigital number, since it uses as much as digits as its factorization.

51620737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7374398.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 51620737 is about 7184.7572679945. The cubic root of 51620737 is about 372.3414624965.

The spelling of 51620737 in words is "fifty-one million, six hundred twenty thousand, seven hundred thirty-seven".