72999869 has 2 divisors, whose sum is σ = 72999870. Its totient is φ = 72999868.

The previous prime is 72999851. The next prime is 72999877. The reversal of 72999869 is 96899927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43731769 + 29268100 = 6613^2 + 5410^2 .

It is a cyclic number.

It is not a de Polignac number, because 72999869 - 2⁸ = 72999613 is a prime.

It is a super-2 number, since 2×72999869² = 10657961748034322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72995869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36499934 + 36499935.

It is an arithmetic number, because the mean of its divisors is an integer number (36499935).

Almost surely, 2^72999869 is an apocalyptic number.

It is an amenable number.

72999869 is a deficient number, since it is larger than the sum of its proper divisors (1).

72999869 is an equidigital number, since it uses as much as digits as its factorization.

72999869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 59.

The square root of 72999869 is about 8543.9960791190. The cubic root of 72999869 is about 417.9336696410.

The spelling of 72999869 in words is "seventy-two million, nine hundred ninety-nine thousand, eight hundred sixty-nine".