78706280649 has 16 divisors (see below), whose sum is σ = 108668689920. Its totient is φ = 50618042880.

The previous prime is 78706280647. The next prime is 78706280651. The reversal of 78706280649 is 94608260787.

It is an interprime number because it is at equal distance from previous prime (78706280647) and next prime (78706280651).

It is not a de Polignac number, because 78706280649 - 2¹ = 78706280647 is a prime.

It is a super-2 number, since 2×78706280649² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78706280647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1305384 + ... + 1364345.

It is an arithmetic number, because the mean of its divisors is an integer number (6791793120).

Almost surely, 2^78706280649 is an apocalyptic number.

It is an amenable number.

78706280649 is a deficient number, since it is larger than the sum of its proper divisors (29962409271).

78706280649 is a wasteful number, since it uses less digits than its factorization.

78706280649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2670080.

The product of its (nonzero) digits is 8128512, while the sum is 57.

The spelling of 78706280649 in words is "seventy-eight billion, seven hundred six million, two hundred eighty thousand, six hundred forty-nine".