78961004 has 6 divisors (see below), whose sum is σ = 138181764. Its totient is φ = 39480500.

The previous prime is 78960991. The next prime is 78961009. The reversal of 78961004 is 40016987.

It is not an unprimeable number, because it can be changed into a prime (78961009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9870122 + ... + 9870129.

It is an arithmetic number, because the mean of its divisors is an integer number (23030294).

Almost surely, 2^78961004 is an apocalyptic number.

It is an amenable number.

78961004 is a deficient number, since it is larger than the sum of its proper divisors (59220760).

78961004 is a wasteful number, since it uses less digits than its factorization.

78961004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19740255 (or 19740253 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 78961004 is about 8886.0004501463. Note that the first 3 decimals coincide. The cubic root of 78961004 is about 429.0134295581.

It can be divided in two parts, 7896100 and 4, that multiplied together give a square (31584400 = 5620²).

The spelling of 78961004 in words is "seventy-eight million, nine hundred sixty-one thousand, four".