721216477800 has 768 divisors, whose sum is σ = 3132124531200. Its totient is φ = 148453171200.

The previous prime is 721216477789. The next prime is 721216477811. The reversal of 721216477800 is 8774612127.

It is an interprime number because it is at equal distance from previous prime (721216477789) and next prime (721216477811).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 20129502 + ... + 20165298.

It is an arithmetic number, because the mean of its divisors is an integer number (4078287150).

Almost surely, 2^721216477800 is an apocalyptic number.

721216477800 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721216477800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1566062265600).

721216477800 is an abundant number, since it is smaller than the sum of its proper divisors (2410908053400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721216477800 is a wasteful number, since it uses less digits than its factorization.

721216477800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35883 (or 35868 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 45.

The spelling of 721216477800 in words is "seven hundred twenty-one billion, two hundred sixteen million, four hundred seventy-seven thousand, eight hundred".