78780725 has 6 divisors (see below), whose sum is σ = 97688130. Its totient is φ = 63024560.

The previous prime is 78780719. The next prime is 78780743. The reversal of 78780725 is 52708787.

It can be written as a sum of positive squares in 3 ways, for example, as 4165681 + 74615044 = 2041^2 + 8638^2 .

It is not a de Polignac number, because 78780725 - 2⁸ = 78780469 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1575590 + ... + 1575639.

It is an arithmetic number, because the mean of its divisors is an integer number (16281355).

Almost surely, 2^78780725 is an apocalyptic number.

It is an amenable number.

78780725 is a deficient number, since it is larger than the sum of its proper divisors (18907405).

78780725 is a wasteful number, since it uses less digits than its factorization.

78780725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3151239 (or 3151234 counting only the distinct ones).

The product of its (nonzero) digits is 219520, while the sum is 44.

The square root of 78780725 is about 8875.8506634576. The cubic root of 78780725 is about 428.6866815691.

The spelling of 78780725 in words is "seventy-eight million, seven hundred eighty thousand, seven hundred twenty-five".