72070261 has 4 divisors (see below), whose sum is σ = 72260800. Its totient is φ = 71879724.

The previous prime is 72070241. The next prime is 72070277. The reversal of 72070261 is 16207027.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16207027 = 29 ⋅558863.

It is a cyclic number.

It is not a de Polignac number, because 72070261 - 2²¹ = 69973109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72070241) 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, 94701 + ... + 95458.

It is an arithmetic number, because the mean of its divisors is an integer number (18065200).

Almost surely, 2^72070261 is an apocalyptic number.

It is an amenable number.

72070261 is a deficient number, since it is larger than the sum of its proper divisors (190539).

72070261 is a wasteful number, since it uses less digits than its factorization.

72070261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190538.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 72070261 is about 8489.4205338174. The cubic root of 72070261 is about 416.1520435508.

Adding to 72070261 its reverse (16207027), we get a palindrome (88277288).

It can be divided in two parts, 7207026 and 1, that added together give a palindrome (7207027).

The spelling of 72070261 in words is "seventy-two million, seventy thousand, two hundred sixty-one".