72857380 has 24 divisors (see below), whose sum is σ = 153535032. Its totient is φ = 29041152.

The previous prime is 72857377. The next prime is 72857383. The reversal of 72857380 is 8375827.

It is an interprime number because it is at equal distance from previous prime (72857377) and next prime (72857383).

It can be written as a sum of positive squares in 4 ways, for example, as 10510564 + 62346816 = 3242^2 + 7896^2 .

It is not an unprimeable number, because it can be changed into a prime (72857383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 357 + ... + 12076.

It is an arithmetic number, because the mean of its divisors is an integer number (6397293).

Almost surely, 2^72857380 is an apocalyptic number.

It is an amenable number.

72857380 is an abundant number, since it is smaller than the sum of its proper divisors (80677652).

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

72857380 is a wasteful number, since it uses less digits than its factorization.

72857380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12735 (or 12733 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 72857380 is about 8535.6534606321. The cubic root of 72857380 is about 417.6615698892.

It can be divided in two parts, 72857 and 380, that added together give a palindrome (73237).

The spelling of 72857380 in words is "seventy-two million, eight hundred fifty-seven thousand, three hundred eighty".