72878545 has 4 divisors (see below), whose sum is σ = 87454260. Its totient is φ = 58302832.

The previous prime is 72878543. The next prime is 72878549. The reversal of 72878545 is 54587827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23892544 + 48986001 = 4888^2 + 6999^2 .

It is a cyclic number.

It is not a de Polignac number, because 72878545 - 2¹ = 72878543 is a prime.

It is a super-2 number, since 2×72878545² = 10622564642634050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72878495 and 72878504.

It is not an unprimeable number, because it can be changed into a prime (72878543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7287850 + ... + 7287859.

It is an arithmetic number, because the mean of its divisors is an integer number (21863565).

Almost surely, 2^72878545 is an apocalyptic number.

It is an amenable number.

72878545 is a deficient number, since it is larger than the sum of its proper divisors (14575715).

72878545 is a wasteful number, since it uses less digits than its factorization.

72878545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14575714.

The product of its digits is 627200, while the sum is 46.

The square root of 72878545 is about 8536.8931702347. The cubic root of 72878545 is about 417.7020094039.

The spelling of 72878545 in words is "seventy-two million, eight hundred seventy-eight thousand, five hundred forty-five".