67479981 has 8 divisors (see below), whose sum is σ = 90064704. Its totient is φ = 44940960.

The previous prime is 67479967. The next prime is 67480009. The reversal of 67479981 is 18997476.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 67479981 - 2⁵ = 67479949 is a prime.

It is a super-2 number, since 2×67479981² = 9107095671520722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67479911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7816 + ... + 14001.

It is an arithmetic number, because the mean of its divisors is an integer number (11258088).

Almost surely, 2^67479981 is an apocalyptic number.

It is an amenable number.

67479981 is a deficient number, since it is larger than the sum of its proper divisors (22584723).

67479981 is a wasteful number, since it uses less digits than its factorization.

67479981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22851.

The product of its digits is 762048, while the sum is 51.

The square root of 67479981 is about 8214.6199546905. The cubic root of 67479981 is about 407.1223867121.

The spelling of 67479981 in words is "sixty-seven million, four hundred seventy-nine thousand, nine hundred eighty-one".