76121857 has 4 divisors (see below), whose sum is σ = 86996416. Its totient is φ = 65247300.

The previous prime is 76121831. The next prime is 76121861. The reversal of 76121857 is 75812167.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75812167 = 71 ⋅1067777.

It is a cyclic number.

It is not a de Polignac number, because 76121857 - 2⁷ = 76121729 is a prime.

It is a super-2 number, since 2×76121857² = 11589074226256898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76121807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5437269 + ... + 5437282.

It is an arithmetic number, because the mean of its divisors is an integer number (21749104).

Almost surely, 2^76121857 is an apocalyptic number.

It is an amenable number.

76121857 is a deficient number, since it is larger than the sum of its proper divisors (10874559).

76121857 is a wasteful number, since it uses less digits than its factorization.

76121857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10874558.

The product of its digits is 23520, while the sum is 37.

The square root of 76121857 is about 8724.7840660958. The cubic root of 76121857 is about 423.8086255879.

The spelling of 76121857 in words is "seventy-six million, one hundred twenty-one thousand, eight hundred fifty-seven".