78349924 has 6 divisors (see below), whose sum is σ = 137112374. Its totient is φ = 39174960.

The previous prime is 78349903. The next prime is 78349933. The reversal of 78349924 is 42994387.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 74476900 + 3873024 = 8630^2 + 1968^2 .

It is a super-2 number, since 2×78349924² = 12277421181611552, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9793737 + ... + 9793744.

Almost surely, 2^78349924 is an apocalyptic number.

It is an amenable number.

78349924 is a deficient number, since it is larger than the sum of its proper divisors (58762450).

78349924 is a wasteful number, since it uses less digits than its factorization.

78349924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19587485 (or 19587483 counting only the distinct ones).

The product of its digits is 435456, while the sum is 46.

The square root of 78349924 is about 8851.5492429292. The cubic root of 78349924 is about 427.9038491905.

The spelling of 78349924 in words is "seventy-eight million, three hundred forty-nine thousand, nine hundred twenty-four".