72261945 has 24 divisors (see below), whose sum is σ = 143148096. Its totient is φ = 33033888.

The previous prime is 72261941. The next prime is 72261947. The reversal of 72261945 is 54916227.

It is not a de Polignac number, because 72261945 - 2² = 72261941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72261941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114387 + ... + 115016.

It is an arithmetic number, because the mean of its divisors is an integer number (5964504).

Almost surely, 2^72261945 is an apocalyptic number.

It is an amenable number.

72261945 is a deficient number, since it is larger than the sum of its proper divisors (70886151).

72261945 is a wasteful number, since it uses less digits than its factorization.

72261945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229421 (or 229418 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 72261945 is about 8500.7026180193. The cubic root of 72261945 is about 416.5206610214.

The spelling of 72261945 in words is "seventy-two million, two hundred sixty-one thousand, nine hundred forty-five".