72478997 has 2 divisors, whose sum is σ = 72478998. Its totient is φ = 72478996.

The previous prime is 72478993. The next prime is 72479009. The reversal of 72478997 is 79987427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64866916 + 7612081 = 8054^2 + 2759^2 .

It is a cyclic number.

It is not a de Polignac number, because 72478997 - 2² = 72478993 is a prime.

It is a super-2 number, since 2×72478997² = 10506410012252018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72478993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36239498 + 36239499.

It is an arithmetic number, because the mean of its divisors is an integer number (36239499).

Almost surely, 2^72478997 is an apocalyptic number.

It is an amenable number.

72478997 is a deficient number, since it is larger than the sum of its proper divisors (1).

72478997 is an equidigital number, since it uses as much as digits as its factorization.

72478997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 53.

The square root of 72478997 is about 8513.4597549997. The cubic root of 72478997 is about 416.9372762288.

The spelling of 72478997 in words is "seventy-two million, four hundred seventy-eight thousand, nine hundred ninety-seven".