72415661 has 8 divisors (see below), whose sum is σ = 75864384. Its totient is φ = 68992000.

The previous prime is 72415657. The next prime is 72415663. The reversal of 72415661 is 16651427.

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

It is a cyclic number.

It is not a de Polignac number, because 72415661 - 2² = 72415657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72415663) 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, 215 + ... + 12036.

It is an arithmetic number, because the mean of its divisors is an integer number (9483048).

Almost surely, 2^72415661 is an apocalyptic number.

It is an amenable number.

72415661 is a deficient number, since it is larger than the sum of its proper divisors (3448723).

72415661 is a wasteful number, since it uses less digits than its factorization.

72415661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12531.

The product of its digits is 10080, while the sum is 32.

The square root of 72415661 is about 8509.7391851925. The cubic root of 72415661 is about 416.8157935182.

The spelling of 72415661 in words is "seventy-two million, four hundred fifteen thousand, six hundred sixty-one".