72421761 has 8 divisors (see below), whose sum is σ = 98808160. Its totient is φ = 47158272.

The previous prime is 72421757. The next prime is 72421781. The reversal of 72421761 is 16712427.

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

It is not a de Polignac number, because 72421761 - 2² = 72421757 is a prime.

It is a super-2 number, since 2×72421761² = 10489822932682242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72421781) 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, 280576 + ... + 280833.

It is an arithmetic number, because the mean of its divisors is an integer number (12351020).

Almost surely, 2^72421761 is an apocalyptic number.

It is an amenable number.

72421761 is a deficient number, since it is larger than the sum of its proper divisors (26386399).

72421761 is a wasteful number, since it uses less digits than its factorization.

72421761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561455.

The product of its digits is 4704, while the sum is 30.

The square root of 72421761 is about 8510.0975905098. The cubic root of 72421761 is about 416.8274968106.

The spelling of 72421761 in words is "seventy-two million, four hundred twenty-one thousand, seven hundred sixty-one".