87451819 has 48 divisors (see below), whose sum is σ = 117669888. Its totient is φ = 64266048.

The previous prime is 87451789. The next prime is 87451823. The reversal of 87451819 is 91815478.

It is a happy number.

It is not a de Polignac number, because 87451819 - 2⁵ = 87451787 is a prime.

It is a super-2 number, since 2×87451819² = 15295641292817522, which contains 22 as substring.

Its product of digits (80640) is a multiple of the sum of its prime factors (224).

It is not an unprimeable number, because it can be changed into a prime (87451879) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 688534 + ... + 688660.

It is an arithmetic number, because the mean of its divisors is an integer number (2451456).

Almost surely, 2^87451819 is an apocalyptic number.

87451819 is a deficient number, since it is larger than the sum of its proper divisors (30218069).

87451819 is a wasteful number, since it uses less digits than its factorization.

87451819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 217 counting only the distinct ones).

The product of its digits is 80640, while the sum is 43.

The square root of 87451819 is about 9351.5677295307. The cubic root of 87451819 is about 443.8705000003.

It can be divided in two parts, 87451 and 819, that multiplied together give a square (71622369 = 8463²).

The spelling of 87451819 in words is "eighty-seven million, four hundred fifty-one thousand, eight hundred nineteen".