623128737 has 72 divisors (see below), whose sum is σ = 1092172896. Its totient is φ = 312480000.

The previous prime is 623128733. The next prime is 623128739. The reversal of 623128737 is 737821326.

It is not a de Polignac number, because 623128737 - 2² = 623128733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 623128695 and 623128704.

It is not an unprimeable number, because it can be changed into a prime (623128733) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1553737 + ... + 1554137.

It is an arithmetic number, because the mean of its divisors is an integer number (15169068).

Almost surely, 2^623128737 is an apocalyptic number.

It is an amenable number.

623128737 is a deficient number, since it is larger than the sum of its proper divisors (469044159).

623128737 is a wasteful number, since it uses less digits than its factorization.

623128737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491 (or 453 counting only the distinct ones).

The product of its digits is 84672, while the sum is 39.

The square root of 623128737 is about 24962.5466849839. The cubic root of 623128737 is about 854.1338364105.

The spelling of 623128737 in words is "six hundred twenty-three million, one hundred twenty-eight thousand, seven hundred thirty-seven".