78226772 has 24 divisors (see below), whose sum is σ = 153839616. Its totient is φ = 34534368.

The previous prime is 78226723. The next prime is 78226777. The reversal of 78226772 is 27762287.

It is a super-2 number, since 2×78226772² = 12238855715079968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78226777) 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, 31508 + ... + 33899.

It is an arithmetic number, because the mean of its divisors is an integer number (6409984).

Almost surely, 2^78226772 is an apocalyptic number.

It is an amenable number.

78226772 is a deficient number, since it is larger than the sum of its proper divisors (75612844).

78226772 is a wasteful number, since it uses less digits than its factorization.

78226772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65447 (or 65445 counting only the distinct ones).

The product of its digits is 131712, while the sum is 41.

The square root of 78226772 is about 8844.5899848438. The cubic root of 78226772 is about 427.6795356389.

The spelling of 78226772 in words is "seventy-eight million, two hundred twenty-six thousand, seven hundred seventy-two".