72870991 has 2 divisors, whose sum is σ = 72870992. Its totient is φ = 72870990.

The previous prime is 72870979. The next prime is 72871003. The reversal of 72870991 is 19907827.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (72870979) and next prime (72871003).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72870991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72870901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36435495 + 36435496.

It is an arithmetic number, because the mean of its divisors is an integer number (36435496).

Almost surely, 2^72870991 is an apocalyptic number.

72870991 is a deficient number, since it is larger than the sum of its proper divisors (1).

72870991 is an equidigital number, since it uses as much as digits as its factorization.

72870991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 72870991 is about 8536.4507261508. The cubic root of 72870991 is about 417.6875770356.

The spelling of 72870991 in words is "seventy-two million, eight hundred seventy thousand, nine hundred ninety-one".