721417760 has 48 divisors (see below), whose sum is σ = 1947830976. Its totient is φ = 247342848.

The previous prime is 721417733. The next prime is 721417769. The reversal of 721417760 is 67714127.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 721417760.

It is not an unprimeable number, because it can be changed into a prime (721417769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320942 + ... + 323181.

It is an arithmetic number, because the mean of its divisors is an integer number (40579812).

Almost surely, 2^721417760 is an apocalyptic number.

721417760 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

721417760 is an abundant number, since it is smaller than the sum of its proper divisors (1226413216).

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

721417760 is a wasteful number, since it uses less digits than its factorization.

721417760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644145 (or 644137 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 721417760 is about 26859.2211353941. The cubic root of 721417760 is about 896.8688558543.

The spelling of 721417760 in words is "seven hundred twenty-one million, four hundred seventeen thousand, seven hundred sixty".