87240401 has 4 divisors (see below), whose sum is σ = 87818304. Its totient is φ = 86662500.

The previous prime is 87240383. The next prime is 87240443. The reversal of 87240401 is 10404278.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87240401 is a prime.

It is a super-2 number, since 2×87240401² = 15221775133281602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87240451) 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, 288725 + ... + 289026.

It is an arithmetic number, because the mean of its divisors is an integer number (21954576).

Almost surely, 2^87240401 is an apocalyptic number.

It is an amenable number.

87240401 is a deficient number, since it is larger than the sum of its proper divisors (577903).

87240401 is a wasteful number, since it uses less digits than its factorization.

87240401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577902.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 87240401 is about 9340.2570093119. The cubic root of 87240401 is about 443.5125202636.

Adding to 87240401 its reverse (10404278), we get a palindrome (97644679).

The spelling of 87240401 in words is "eighty-seven million, two hundred forty thousand, four hundred one".