72771390 has 48 divisors (see below), whose sum is σ = 200339568. Its totient is φ = 18263808.

The previous prime is 72771383. The next prime is 72771421. The reversal of 72771390 is 9317727.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22252 + ... + 25311.

It is an arithmetic number, because the mean of its divisors is an integer number (4173741).

Almost surely, 2^72771390 is an apocalyptic number.

72771390 is an abundant number, since it is smaller than the sum of its proper divisors (127568178).

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

72771390 is a wasteful number, since it uses less digits than its factorization.

72771390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47593 (or 47590 counting only the distinct ones).

The product of its (nonzero) digits is 18522, while the sum is 36.

The square root of 72771390 is about 8530.6148664677. The cubic root of 72771390 is about 417.4971900321.

The spelling of 72771390 in words is "seventy-two million, seven hundred seventy-one thousand, three hundred ninety".