72078031 has 2 divisors, whose sum is σ = 72078032. Its totient is φ = 72078030.

The previous prime is 72077987. The next prime is 72078047. The reversal of 72078031 is 13087027.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13087027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72078031 - 2¹⁹ = 71553743 is a prime.

It is a super-2 number, since 2×72078031² = 10390485105673922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72078091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36039015 + 36039016.

It is an arithmetic number, because the mean of its divisors is an integer number (36039016).

Almost surely, 2^72078031 is an apocalyptic number.

72078031 is a deficient number, since it is larger than the sum of its proper divisors (1).

72078031 is an equidigital number, since it uses as much as digits as its factorization.

72078031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 72078031 is about 8489.8781498912. The cubic root of 72078031 is about 416.1669983330.

The spelling of 72078031 in words is "seventy-two million, seventy-eight thousand, thirty-one".