705020721 has 8 divisors (see below), whose sum is σ = 941659104. Its totient is φ = 469198080.

The previous prime is 705020671. The next prime is 705020741. The reversal of 705020721 is 127020507.

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

It is not a de Polignac number, because 705020721 - 2¹⁵ = 704987953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 705020691 and 705020700.

It is not an unprimeable number, because it can be changed into a prime (705020741) 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, 201915 + ... + 205376.

It is an arithmetic number, because the mean of its divisors is an integer number (117707388).

Almost surely, 2^705020721 is an apocalyptic number.

It is an amenable number.

705020721 is a deficient number, since it is larger than the sum of its proper divisors (236638383).

705020721 is a wasteful number, since it uses less digits than its factorization.

705020721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407871.

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 705020721 is about 26552.2262908405. The cubic root of 705020721 is about 890.0217648172.

The spelling of 705020721 in words is "seven hundred five million, twenty thousand, seven hundred twenty-one".