78431552 has 14 divisors (see below), whose sum is σ = 155637738. Its totient is φ = 39215744.

The previous prime is 78431539. The next prime is 78431567. The reversal of 78431552 is 25513487.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 68293696 + 10137856 = 8264^2 + 3184^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612683 + ... + 612810.

Almost surely, 2^78431552 is an apocalyptic number.

It is an amenable number.

78431552 is a deficient number, since it is larger than the sum of its proper divisors (77206186).

78431552 is a wasteful number, since it uses less digits than its factorization.

78431552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225505 (or 1225495 counting only the distinct ones).

The product of its digits is 33600, while the sum is 35.

The square root of 78431552 is about 8856.1589868294. The cubic root of 78431552 is about 428.0523999081.

The spelling of 78431552 in words is "seventy-eight million, four hundred thirty-one thousand, five hundred fifty-two".