72072766 has 4 divisors (see below), whose sum is σ = 108109152. Its totient is φ = 36036382.

The previous prime is 72072713. The next prime is 72072769. The reversal of 72072766 is 66727027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66727027 = 457 ⋅146011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72072769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18018190 + ... + 18018193.

It is an arithmetic number, because the mean of its divisors is an integer number (27027288).

Almost surely, 2^72072766 is an apocalyptic number.

72072766 is a deficient number, since it is larger than the sum of its proper divisors (36036386).

72072766 is a wasteful number, since it uses less digits than its factorization.

72072766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36036385.

The product of its (nonzero) digits is 49392, while the sum is 37.

The square root of 72072766 is about 8489.5680691069. The cubic root of 72072766 is about 416.1568649976.

The spelling of 72072766 in words is "seventy-two million, seventy-two thousand, seven hundred sixty-six".