78011761 has 8 divisors (see below), whose sum is σ = 79976160. Its totient is φ = 76054272.

The previous prime is 78011753. The next prime is 78011767. The reversal of 78011761 is 16711087.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78011761 - 2³ = 78011753 is a prime.

It is a super-2 number, since 2×78011761² = 12171669708642242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78011767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26961 + ... + 29713.

It is an arithmetic number, because the mean of its divisors is an integer number (9997020).

Almost surely, 2^78011761 is an apocalyptic number.

It is an amenable number.

78011761 is a deficient number, since it is larger than the sum of its proper divisors (1964399).

78011761 is a wasteful number, since it uses less digits than its factorization.

78011761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3455.

The product of its (nonzero) digits is 2352, while the sum is 31.

The square root of 78011761 is about 8832.4266767407. The cubic root of 78011761 is about 427.2873417652.

The spelling of 78011761 in words is "seventy-eight million, eleven thousand, seven hundred sixty-one".