72907397 has 4 divisors (see below), whose sum is σ = 73234560. Its totient is φ = 72580236.

The previous prime is 72907391. The next prime is 72907399. The reversal of 72907397 is 79370927.

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: 79370927 = 179 ⋅443413.

It is a cyclic number.

It is not a de Polignac number, because 72907397 - 2⁶ = 72907333 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 (72907391) 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, 163247 + ... + 163692.

It is an arithmetic number, because the mean of its divisors is an integer number (18308640).

Almost surely, 2^72907397 is an apocalyptic number.

It is an amenable number.

72907397 is a deficient number, since it is larger than the sum of its proper divisors (327163).

72907397 is a wasteful number, since it uses less digits than its factorization.

72907397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327162.

The product of its (nonzero) digits is 166698, while the sum is 44.

The square root of 72907397 is about 8538.5828449456. The cubic root of 72907397 is about 417.7571236965.

The spelling of 72907397 in words is "seventy-two million, nine hundred seven thousand, three hundred ninety-seven".