72771506 has 4 divisors (see below), whose sum is σ = 109157262. Its totient is φ = 36385752.

The previous prime is 72771499. The next prime is 72771551. The reversal of 72771506 is 60517727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60517727 = 43 ⋅1407389.

It can be written as a sum of positive squares in only one way, i.e., 36711481 + 36060025 = 6059^2 + 6005^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18192875 + ... + 18192878.

Almost surely, 2^72771506 is an apocalyptic number.

72771506 is a deficient number, since it is larger than the sum of its proper divisors (36385756).

72771506 is a wasteful number, since it uses less digits than its factorization.

72771506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36385755.

The product of its (nonzero) digits is 20580, while the sum is 35.

The square root of 72771506 is about 8530.6216655060. The cubic root of 72771506 is about 417.4974118668.

The spelling of 72771506 in words is "seventy-two million, seven hundred seventy-one thousand, five hundred six".