621069738 has 32 divisors (see below), whose sum is σ = 1316497536. Its totient is φ = 194654208.

The previous prime is 621069719. The next prime is 621069749. The reversal of 621069738 is 837960126.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 621069738.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130570 + ... + 135242.

It is an arithmetic number, because the mean of its divisors is an integer number (41140548).

Almost surely, 2^621069738 is an apocalyptic number.

621069738 is an abundant number, since it is smaller than the sum of its proper divisors (695427798).

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

621069738 is a wasteful number, since it uses less digits than its factorization.

621069738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5998.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 621069738 is about 24921.2707942432. The cubic root of 621069738 is about 853.1920292489.

The spelling of 621069738 in words is "six hundred twenty-one million, sixty-nine thousand, seven hundred thirty-eight".