67631928 has 128 divisors (see below), whose sum is σ = 210470400. Its totient is φ = 17634816.

The previous prime is 67631911. The next prime is 67631947. The reversal of 67631928 is 82913676.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 67631928.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 377743 + ... + 377921.

It is an arithmetic number, because the mean of its divisors is an integer number (1644300).

Almost surely, 2^67631928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67631928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105235200).

67631928 is an abundant number, since it is smaller than the sum of its proper divisors (142838472).

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

67631928 is a wasteful number, since it uses less digits than its factorization.

67631928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 377 counting only the distinct ones).

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

The square root of 67631928 is about 8223.8633257126. The cubic root of 67631928 is about 407.4277348111.

The spelling of 67631928 in words is "sixty-seven million, six hundred thirty-one thousand, nine hundred twenty-eight".