78641492 has 6 divisors (see below), whose sum is σ = 137622618. Its totient is φ = 39320744.

The previous prime is 78641483. The next prime is 78641501. The reversal of 78641492 is 29414687.

It is an interprime number because it is at equal distance from previous prime (78641483) and next prime (78641501).

It can be written as a sum of positive squares in only one way, i.e., 72658576 + 5982916 = 8524^2 + 2446^2 .

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, 9830183 + ... + 9830190.

It is an arithmetic number, because the mean of its divisors is an integer number (22937103).

Almost surely, 2^78641492 is an apocalyptic number.

It is an amenable number.

78641492 is a deficient number, since it is larger than the sum of its proper divisors (58981126).

78641492 is a wasteful number, since it uses less digits than its factorization.

78641492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19660377 (or 19660375 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 78641492 is about 8868.0038340091. The cubic root of 78641492 is about 428.4339863822.

The spelling of 78641492 in words is "seventy-eight million, six hundred forty-one thousand, four hundred ninety-two".