76721251 has 8 divisors (see below), whose sum is σ = 78037344. Its totient is φ = 75411840.

The previous prime is 76721219. The next prime is 76721257. The reversal of 76721251 is 15212767.

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

It is a cyclic number.

It is not a de Polignac number, because 76721251 - 2⁵ = 76721219 is a prime.

It is a super-3 number, since 3×76721251³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76721257) 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, 25035 + ... + 27931.

It is an arithmetic number, because the mean of its divisors is an integer number (9754668).

Almost surely, 2^76721251 is an apocalyptic number.

76721251 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

76721251 is a deficient number, since it is larger than the sum of its proper divisors (1316093).

76721251 is a wasteful number, since it uses less digits than its factorization.

76721251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3341.

The product of its digits is 5880, while the sum is 31.

The square root of 76721251 is about 8759.0667881915. The cubic root of 76721251 is about 424.9180944816.

The spelling of 76721251 in words is "seventy-six million, seven hundred twenty-one thousand, two hundred fifty-one".