72401709 has 8 divisors (see below), whose sum is σ = 99649792. Its totient is φ = 46710720.

The previous prime is 72401701. The next prime is 72401713. The reversal of 72401709 is 90710427.

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

It is not a de Polignac number, because 72401709 - 2³ = 72401701 is a prime.

It is a super-2 number, since 2×72401709² = 10484014932241362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72401701) 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 7 ways as a sum of consecutive naturals, for example, 389164 + ... + 389349.

It is an arithmetic number, because the mean of its divisors is an integer number (12456224).

Almost surely, 2^72401709 is an apocalyptic number.

It is an amenable number.

72401709 is a deficient number, since it is larger than the sum of its proper divisors (27248083).

72401709 is a wasteful number, since it uses less digits than its factorization.

72401709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778547.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 72401709 is about 8508.9193790986. The cubic root of 72401709 is about 416.7890231236.

The spelling of 72401709 in words is "seventy-two million, four hundred one thousand, seven hundred nine".