78477772 has 12 divisors (see below), whose sum is σ = 140686056. Its totient is φ = 38281760.

The previous prime is 78477767. The next prime is 78477779. The reversal of 78477772 is 27777487.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (78477779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239098 + ... + 239425.

It is an arithmetic number, because the mean of its divisors is an integer number (11723838).

Almost surely, 2^78477772 is an apocalyptic number.

It is an amenable number.

78477772 is a deficient number, since it is larger than the sum of its proper divisors (62208284).

78477772 is a wasteful number, since it uses less digits than its factorization.

78477772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478568 (or 478566 counting only the distinct ones).

The product of its digits is 1075648, while the sum is 49.

The square root of 78477772 is about 8858.7680859135. The cubic root of 78477772 is about 428.1364676773.

The spelling of 78477772 in words is "seventy-eight million, four hundred seventy-seven thousand, seven hundred seventy-two".