78293961 has 12 divisors (see below), whose sum is σ = 116148292. Its totient is φ = 50785056.

The previous prime is 78293899. The next prime is 78293981. The reversal of 78293961 is 16939287.

It can be written as a sum of positive squares in 2 ways, for example, as 49617936 + 28676025 = 7044^2 + 5355^2 .

It is not a de Polignac number, because 78293961 - 2¹⁰ = 78292937 is a prime.

It is a super-2 number, since 2×78293961² = 12259888658139042, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78293981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117226 + ... + 117891.

Almost surely, 2^78293961 is an apocalyptic number.

It is an amenable number.

78293961 is a deficient number, since it is larger than the sum of its proper divisors (37854331).

78293961 is a wasteful number, since it uses less digits than its factorization.

78293961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235160 (or 235157 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 78293961 is about 8848.3874802136. The cubic root of 78293961 is about 427.8019452973.

The spelling of 78293961 in words is "seventy-eight million, two hundred ninety-three thousand, nine hundred sixty-one".