67421904 has 80 divisors (see below), whose sum is σ = 191505600. Its totient is φ = 20270080.

The previous prime is 67421903. The next prime is 67421909. The reversal of 67421904 is 40912476.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67421903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78244 + ... + 79100.

It is an arithmetic number, because the mean of its divisors is an integer number (2393820).

Almost surely, 2^67421904 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 67421904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95752800).

67421904 is an abundant number, since it is smaller than the sum of its proper divisors (124083696).

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

67421904 is a wasteful number, since it uses less digits than its factorization.

67421904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028 (or 1022 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 67421904 is about 8211.0842158633. The cubic root of 67421904 is about 407.0055558486.

It can be divided in two parts, 6742 and 1904, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 67421904 in words is "sixty-seven million, four hundred twenty-one thousand, nine hundred four".