72720834 has 16 divisors (see below), whose sum is σ = 145539072. Its totient is φ = 24224048.

The previous prime is 72720829. The next prime is 72720853. The reversal of 72720834 is 43802727.

It is a junction number, because it is equal to n+sod(n) for n = 72720795 and 72720804.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8767 + ... + 14909.

It is an arithmetic number, because the mean of its divisors is an integer number (9096192).

Almost surely, 2^72720834 is an apocalyptic number.

72720834 is an abundant number, since it is smaller than the sum of its proper divisors (72818238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72720834 is a wasteful number, since it uses less digits than its factorization.

72720834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8121.

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 72720834 is about 8527.6511420203. The cubic root of 72720834 is about 417.4004859214.

The spelling of 72720834 in words is "seventy-two million, seven hundred twenty thousand, eight hundred thirty-four".