72326557778 has 32 divisors (see below), whose sum is σ = 109880712000. Its totient is φ = 35703581760.

The previous prime is 72326557733. The next prime is 72326557789. The reversal of 72326557778 is 87775562327.

It is a super-2 number, since 2×72326557778² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31874828 + ... + 31877096.

It is an arithmetic number, because the mean of its divisors is an integer number (3433772250).

Almost surely, 2^72326557778 is an apocalyptic number.

72326557778 is a deficient number, since it is larger than the sum of its proper divisors (37554154222).

72326557778 is a wasteful number, since it uses less digits than its factorization.

72326557778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3050.

The product of its digits is 34574400, while the sum is 59.

The spelling of 72326557778 in words is "seventy-two billion, three hundred twenty-six million, five hundred fifty-seven thousand, seven hundred seventy-eight".