72400277 has 4 divisors (see below), whose sum is σ = 72491916. Its totient is φ = 72308640.

The previous prime is 72400259. The next prime is 72400357. The reversal of 72400277 is 77200427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77200427 = 3769 ⋅20483.

It can be written as a sum of positive squares in 2 ways, for example, as 55965361 + 16434916 = 7481^2 + 4054^2 .

It is a cyclic number.

It is not a de Polignac number, because 72400277 - 2⁶ = 72400213 is a prime.

It is a super-3 number, since 3×72400277³ (a number of 25 digits) contains 333 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 (72400247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44624 + ... + 46217.

It is an arithmetic number, because the mean of its divisors is an integer number (18122979).

Almost surely, 2^72400277 is an apocalyptic number.

It is an amenable number.

72400277 is a deficient number, since it is larger than the sum of its proper divisors (91639).

72400277 is an equidigital number, since it uses as much as digits as its factorization.

72400277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91638.

The product of its (nonzero) digits is 5488, while the sum is 29.

The square root of 72400277 is about 8508.8352316871. The cubic root of 72400277 is about 416.7862752796.

The spelling of 72400277 in words is "seventy-two million, four hundred thousand, two hundred seventy-seven".