72061769 has 6 divisors (see below), whose sum is σ = 78031566. Its totient is φ = 66518400.

The previous prime is 72061757. The next prime is 72061819. The reversal of 72061769 is 96716027.

It can be written as a sum of positive squares in 3 ways, for example, as 15625 + 72046144 = 125^2 + 8488^2 .

It is not a de Polignac number, because 72061769 - 2²⁴ = 55284553 is a prime.

It is a super-2 number, since 2×72061769² = 10385797102818722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72061729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213032 + ... + 213369.

It is an arithmetic number, because the mean of its divisors is an integer number (13005261).

Almost surely, 2^72061769 is an apocalyptic number.

It is an amenable number.

72061769 is a deficient number, since it is larger than the sum of its proper divisors (5969797).

72061769 is a wasteful number, since it uses less digits than its factorization.

72061769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426427 (or 426414 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 72061769 is about 8488.9203671610. The cubic root of 72061769 is about 416.1356979184.

The spelling of 72061769 in words is "seventy-two million, sixty-one thousand, seven hundred sixty-nine".