72067757 has 4 divisors (see below), whose sum is σ = 73427580. Its totient is φ = 70707936.

The previous prime is 72067753. The next prime is 72067759. The reversal of 72067757 is 75776027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75776027 = 233 ⋅325219.

It can be written as a sum of positive squares in 2 ways, for example, as 47969476 + 24098281 = 6926^2 + 4909^2 .

It is not a de Polignac number, because 72067757 - 2² = 72067753 is a prime.

It is a super-2 number, since 2×72067757² = 10387523198022098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72067753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 679832 + ... + 679937.

It is an arithmetic number, because the mean of its divisors is an integer number (18356895).

Almost surely, 2^72067757 is an apocalyptic number.

It is an amenable number.

72067757 is a deficient number, since it is larger than the sum of its proper divisors (1359823).

72067757 is a wasteful number, since it uses less digits than its factorization.

72067757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359822.

The product of its (nonzero) digits is 144060, while the sum is 41.

The square root of 72067757 is about 8489.2730548616. The cubic root of 72067757 is about 416.1472239170.

The spelling of 72067757 in words is "seventy-two million, sixty-seven thousand, seven hundred fifty-seven".