72149391890 has 8 divisors (see below), whose sum is σ = 129868905420. Its totient is φ = 28859756752.

The previous prime is 72149391877. The next prime is 72149391907. The reversal of 72149391890 is 9819394127.

It can be written as a sum of positive squares in 2 ways, for example, as 70994003809 + 1155388081 = 266447^2 + 33991^2 .

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

It is a Curzon number.

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, 3607469585 + ... + 3607469604.

Almost surely, 2^72149391890 is an apocalyptic number.

72149391890 is a deficient number, since it is larger than the sum of its proper divisors (57719513530).

72149391890 is a wasteful number, since it uses less digits than its factorization.

72149391890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7214939196.

The product of its (nonzero) digits is 979776, while the sum is 53.

The spelling of 72149391890 in words is "seventy-two billion, one hundred forty-nine million, three hundred ninety-one thousand, eight hundred ninety".