72278390 has 32 divisors (see below), whose sum is σ = 141489504. Its totient is φ = 26472960.

The previous prime is 72278387. The next prime is 72278419. The reversal of 72278390 is 9387227.

72278390 = 281² + 282² + ... + 620².

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 545 + ... + 12035.

It is an arithmetic number, because the mean of its divisors is an integer number (4421547).

Almost surely, 2^72278390 is an apocalyptic number.

72278390 is a deficient number, since it is larger than the sum of its proper divisors (69211114).

72278390 is a wasteful number, since it uses less digits than its factorization.

72278390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11552.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 72278390 is about 8501.6698359793. The cubic root of 72278390 is about 416.5522551647.

The spelling of 72278390 in words is "seventy-two million, two hundred seventy-eight thousand, three hundred ninety".