72979481 has 4 divisors (see below), whose sum is σ = 73098000. Its totient is φ = 72860964.

The previous prime is 72979477. The next prime is 72979499. The reversal of 72979481 is 18497927.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18497927 = 7 ⋅2642561.

It is a cyclic number.

It is not a de Polignac number, because 72979481 - 2² = 72979477 is a prime.

It is a super-2 number, since 2×72979481² = 10652009294058722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72979411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58331 + ... + 59568.

It is an arithmetic number, because the mean of its divisors is an integer number (18274500).

Almost surely, 2^72979481 is an apocalyptic number.

It is an amenable number.

72979481 is a deficient number, since it is larger than the sum of its proper divisors (118519).

72979481 is a wasteful number, since it uses less digits than its factorization.

72979481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118518.

The product of its digits is 254016, while the sum is 47.

The square root of 72979481 is about 8542.8028772763. The cubic root of 72979481 is about 417.8947580413.

The spelling of 72979481 in words is "seventy-two million, nine hundred seventy-nine thousand, four hundred eighty-one".