72787730 has 8 divisors (see below), whose sum is σ = 131017932. Its totient is φ = 29115088.

The previous prime is 72787717. The next prime is 72787787. The reversal of 72787730 is 3778727.

It can be written as a sum of positive squares in 2 ways, for example, as 72573361 + 214369 = 8519^2 + 463^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3639377 + ... + 3639396.

Almost surely, 2^72787730 is an apocalyptic number.

72787730 is a deficient number, since it is larger than the sum of its proper divisors (58230202).

72787730 is a wasteful number, since it uses less digits than its factorization.

72787730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7278780.

The product of its (nonzero) digits is 115248, while the sum is 41.

The square root of 72787730 is about 8531.5725396904. The cubic root of 72787730 is about 417.5284357985.

The spelling of 72787730 in words is "seventy-two million, seven hundred eighty-seven thousand, seven hundred thirty".