78011892 has 36 divisors (see below), whose sum is σ = 225368416. Its totient is φ = 22289040.

The previous prime is 78011851. The next prime is 78011911. The reversal of 78011892 is 29811087.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154534 + ... + 155037.

Almost surely, 2^78011892 is an apocalyptic number.

It is an amenable number.

78011892 is an abundant number, since it is smaller than the sum of its proper divisors (147356524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78011892 is a wasteful number, since it uses less digits than its factorization.

78011892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309588 (or 309583 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 78011892 is about 8832.4340925930. The cubic root of 78011892 is about 427.2875809369.

The spelling of 78011892 in words is "seventy-eight million, eleven thousand, eight hundred ninety-two".