621890934 has 48 divisors (see below), whose sum is σ = 1452569088. Its totient is φ = 173876688.

The previous prime is 621890921. The next prime is 621890939. The reversal of 621890934 is 439098126.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621890939) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89427 + ... + 96129.

It is an arithmetic number, because the mean of its divisors is an integer number (30261856).

Almost surely, 2^621890934 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621890934, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (726284544).

621890934 is an abundant number, since it is smaller than the sum of its proper divisors (830678154).

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

621890934 is a wasteful number, since it uses less digits than its factorization.

621890934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6809 (or 6762 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 621890934 is about 24937.7411567287. The cubic root of 621890934 is about 853.5679018572.

The spelling of 621890934 in words is "six hundred twenty-one million, eight hundred ninety thousand, nine hundred thirty-four".