628537638 has 16 divisors (see below), whose sum is σ = 1258112880. Its totient is φ = 209339616.

The previous prime is 628537633. The next prime is 628537649. The reversal of 628537638 is 836735826.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628537631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35245 + ... + 49992.

It is an arithmetic number, because the mean of its divisors is an integer number (78632055).

Almost surely, 2^628537638 is an apocalyptic number.

628537638 is an abundant number, since it is smaller than the sum of its proper divisors (629575242).

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

628537638 is a wasteful number, since it uses less digits than its factorization.

628537638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86471.

The product of its digits is 1451520, while the sum is 48.

The square root of 628537638 is about 25070.6529232886. The cubic root of 628537638 is about 856.5980795333.

The spelling of 628537638 in words is "six hundred twenty-eight million, five hundred thirty-seven thousand, six hundred thirty-eight".