78420032770 has 16 divisors (see below), whose sum is σ = 141474703680. Its totient is φ = 31297203184.

The previous prime is 78420032749. The next prime is 78420032773. The reversal of 78420032770 is 7723002487.

It is a super-2 number, since 2×78420032770² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78420032773) 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, 8846590 + ... + 8855449.

It is an arithmetic number, because the mean of its divisors is an integer number (8842168980).

Almost surely, 2^78420032770 is an apocalyptic number.

78420032770 is a deficient number, since it is larger than the sum of its proper divisors (63054670910).

78420032770 is a wasteful number, since it uses less digits than its factorization.

78420032770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17702489.

The product of its (nonzero) digits is 131712, while the sum is 40.

The spelling of 78420032770 in words is "seventy-eight billion, four hundred twenty million, thirty-two thousand, seven hundred seventy".