64994890 has 32 divisors (see below), whose sum is σ = 121492224. Its totient is φ = 25016640.

The previous prime is 64994869. The next prime is 64994921. The reversal of 64994890 is 9849946.

It is a super-2 number, since 2×64994890² = 8448671452224200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27537 + ... + 29803.

It is an arithmetic number, because the mean of its divisors is an integer number (3796632).

Almost surely, 2^64994890 is an apocalyptic number.

64994890 is a deficient number, since it is larger than the sum of its proper divisors (56497334).

64994890 is a wasteful number, since it uses less digits than its factorization.

64994890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 64994890 is about 8061.9408333230. The cubic root of 64994890 is about 402.0620392194.

The spelling of 64994890 in words is "sixty-four million, nine hundred ninety-four thousand, eight hundred ninety".