78222021124 has 81 divisors (see below), whose sum is σ = 153606888981. Its totient is φ = 34837189920.

The previous prime is 78222021121. The next prime is 78222021167. The reversal of 78222021124 is 42112022287.

The square root of 78222021124 is 279682.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 11571304900 + 66650716224 = 107570^2 + 258168^2 .

It is a super-2 number, since 2×78222021124² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (78222021121) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 225423519 + ... + 225423865.

Almost surely, 2^78222021124 is an apocalyptic number.

78222021124 is the 279682-nd square number.

It is an amenable number.

78222021124 is a deficient number, since it is larger than the sum of its proper divisors (75384867857).

78222021124 is a wasteful number, since it uses less digits than its factorization.

78222021124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The spelling of 78222021124 in words is "seventy-eight billion, two hundred twenty-two million, twenty-one thousand, one hundred twenty-four".