780000720649 has 8 divisors (see below), whose sum is σ = 807108144480. Its totient is φ = 753300927456.

The previous prime is 780000720647. The next prime is 780000720659. The reversal of 780000720649 is 946027000087.

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

It is a cyclic number.

It is not a de Polignac number, because 780000720649 - 2¹ = 780000720647 is a prime.

It is a super-2 number, since 2×780000720649² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780000720641) 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, 101903767 + ... + 101911420.

It is an arithmetic number, because the mean of its divisors is an integer number (100888518060).

Almost surely, 2^780000720649 is an apocalyptic number.

It is an amenable number.

780000720649 is a deficient number, since it is larger than the sum of its proper divisors (27107423831).

780000720649 is a wasteful number, since it uses less digits than its factorization.

780000720649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203815319.

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 780000720649 in words is "seven hundred eighty billion, seven hundred twenty thousand, six hundred forty-nine".