78420699652 has 12 divisors (see below), whose sum is σ = 137238576076. Its totient is φ = 39209677920.

The previous prime is 78420699641. The next prime is 78420699667. The reversal of 78420699652 is 25699602487.

It can be written as a sum of positive squares in 2 ways, for example, as 56465165376 + 21955534276 = 237624^2 + 148174^2 .

It is a super-2 number, since 2×78420699652² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170338 + ... + 431110.

Almost surely, 2^78420699652 is an apocalyptic number.

It is an amenable number.

78420699652 is a deficient number, since it is larger than the sum of its proper divisors (58817876424).

78420699652 is a wasteful number, since it uses less digits than its factorization.

78420699652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335958 (or 335956 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 58.

The spelling of 78420699652 in words is "seventy-eight billion, four hundred twenty million, six hundred ninety-nine thousand, six hundred fifty-two".