72247461 has 16 divisors (see below), whose sum is σ = 113171520. Its totient is φ = 40417920.

The previous prime is 72247457. The next prime is 72247463. The reversal of 72247461 is 16474227.

It is not a de Polignac number, because 72247461 - 2² = 72247457 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72247463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83776 + ... + 84633.

It is an arithmetic number, because the mean of its divisors is an integer number (7073220).

Almost surely, 2^72247461 is an apocalyptic number.

It is an amenable number.

72247461 is a deficient number, since it is larger than the sum of its proper divisors (40924059).

72247461 is a wasteful number, since it uses less digits than its factorization.

72247461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168436.

The product of its digits is 18816, while the sum is 33.

The square root of 72247461 is about 8499.8506457467. The cubic root of 72247461 is about 416.4928303821.

The spelling of 72247461 in words is "seventy-two million, two hundred forty-seven thousand, four hundred sixty-one".