67781016 has 64 divisors (see below), whose sum is σ = 190015200. Its totient is φ = 22385664.

The previous prime is 67780991. The next prime is 67781039. The reversal of 67781016 is 61018776.

It is a happy number.

It is a super-2 number, since 2×67781016² = 9188532259984512, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 23020 + ... + 25796.

Almost surely, 2^67781016 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 67781016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95007600).

67781016 is an abundant number, since it is smaller than the sum of its proper divisors (122234184).

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

67781016 is a wasteful number, since it uses less digits than its factorization.

67781016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2905 (or 2895 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 67781016 is about 8232.9226888147. The cubic root of 67781016 is about 407.7268933535.

The spelling of 67781016 in words is "sixty-seven million, seven hundred eighty-one thousand, sixteen".