78298390655 has 8 divisors (see below), whose sum is σ = 94035280752. Its totient is φ = 62587237888.

The previous prime is 78298390649. The next prime is 78298390663. The reversal of 78298390655 is 55609389287.

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 78298390655 - 2³⁶ = 9578913919 is a prime.

It is a super-2 number, since 2×78298390655² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6427637 + ... + 6439806.

It is an arithmetic number, because the mean of its divisors is an integer number (11754410094).

Almost surely, 2^78298390655 is an apocalyptic number.

78298390655 is a deficient number, since it is larger than the sum of its proper divisors (15736890097).

78298390655 is a wasteful number, since it uses less digits than its factorization.

78298390655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12868665.

The product of its (nonzero) digits is 32659200, while the sum is 62.

The spelling of 78298390655 in words is "seventy-eight billion, two hundred ninety-eight million, three hundred ninety thousand, six hundred fifty-five".