72478311890 has 16 divisors (see below), whose sum is σ = 130514060160. Its totient is φ = 28979525040.

The previous prime is 72478311889. The next prime is 72478311923. The reversal of 72478311890 is 9811387427.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1449146 + ... + 1498325.

It is an arithmetic number, because the mean of its divisors is an integer number (8157128760).

Almost surely, 2^72478311890 is an apocalyptic number.

72478311890 is a deficient number, since it is larger than the sum of its proper divisors (58035748270).

72478311890 is a wasteful number, since it uses less digits than its factorization.

72478311890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2949937.

The product of its (nonzero) digits is 677376, while the sum is 50.

The spelling of 72478311890 in words is "seventy-two billion, four hundred seventy-eight million, three hundred eleven thousand, eight hundred ninety".