78641954 has 4 divisors (see below), whose sum is σ = 117962934. Its totient is φ = 39320976.

The previous prime is 78641921. The next prime is 78641957. The reversal of 78641954 is 45914687.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 48094225 + 30547729 = 6935^2 + 5527^2 .

It is not an unprimeable number, because it can be changed into a prime (78641957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19660487 + ... + 19660490.

Almost surely, 2^78641954 is an apocalyptic number.

78641954 is a deficient number, since it is larger than the sum of its proper divisors (39320980).

78641954 is a wasteful number, since it uses less digits than its factorization.

78641954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39320979.

The product of its digits is 241920, while the sum is 44.

The square root of 78641954 is about 8868.0298826741. The cubic root of 78641954 is about 428.4348253631.

The spelling of 78641954 in words is "seventy-eight million, six hundred forty-one thousand, nine hundred fifty-four".