77648709240 has 80 divisors (see below), whose sum is σ = 260985950280. Its totient is φ = 20706321600.

The previous prime is 77648709233. The next prime is 77648709241. The reversal of 77648709240 is 4290784677.

77648709240 is a `hidden beast` number, since 7 + 76 + 487 + 0 + 92 + 4 + 0 = 666.

It is a super-2 number, since 2×77648709240² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77648709241) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11979586 + ... + 11986065.

Almost surely, 2^77648709240 is an apocalyptic number.

It is an amenable number.

77648709240 is an abundant number, since it is smaller than the sum of its proper divisors (183337241040).

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

77648709240 is a wasteful number, since it uses less digits than its factorization.

77648709240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23965674 (or 23965661 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 54.

The spelling of 77648709240 in words is "seventy-seven billion, six hundred forty-eight million, seven hundred nine thousand, two hundred forty".