78125690 has 8 divisors (see below), whose sum is σ = 140626260. Its totient is φ = 31250272.

The previous prime is 78125683. The next prime is 78125731. The reversal of 78125690 is 9652187.

It can be written as a sum of positive squares in 2 ways, for example, as 77986561 + 139129 = 8831^2 + 373^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78125690² = 12207246875952200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3906275 + ... + 3906294.

Almost surely, 2^78125690 is an apocalyptic number.

78125690 is a deficient number, since it is larger than the sum of its proper divisors (62500570).

78125690 is a wasteful number, since it uses less digits than its factorization.

78125690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7812576.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 78125690 is about 8838.8737970400. The cubic root of 78125690 is about 427.4952452078.

The spelling of 78125690 in words is "seventy-eight million, one hundred twenty-five thousand, six hundred ninety".